primary telescope mirror
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Orion SpaceProbe 3 Altazimuth Reflector Telescope
Sale Price: $99.99  |
DescriptionOrion's surprising little Spaceprobe 3 has been picked by independent reviewers as one of the best telescopes in its price class. Unlike similar telescopes seen in discount stores, Orion has refined the Spaceprobe 3 by paying attention to the little details, and that make this telescope a great value. The Spaceprobe 3 comes with an unusually complete set of accessories. The package includes two very good Explorer II eyepieces (25mm and 10mm), an adjustable altazimuth tripod, a good red-dot finder, a student edition of "The Sky" planetarium program, and a well written manual. The package even includes the tools you'll need to assemble the telescope and align the optics. The Spaceprobe 3 is a Newtonian reflector. That means it uses mirrors instead of lenses. Newtonians are primarily used for astronomy because the images are upside-down. Orion includes a collimation tool and good directions for aligning the mirrors. The reward for aligning the mirrors is seen in images that snap into sharp focus. My Spaceprobe 3 arrived properly aligned right out of the box. With its Explorer II eyepieces, this telescope consistently delivers fine views. Using the 25mm eyepiece (28x magnification) the Pleiades cluster is simply wonderful, showing dozens of stars. From a rural location with a dark sky, the Orion Nebula is a big ghostly glow, and when I zoom in with the 10mm eyepiece, the Trapezium resolves into four tiny pinpoints. The double star Gamma Andromeda becomes two beads of light, one gold, the other one pale blue. Moon and planet images are crisp, with none of the false color I see in low cost refractors. When I look at the Moon I see mountains and terraced walls inside the larger craters. With the 10mm eyepiece (about 70x), Saturn's rings are sharply separated from the planet, and I can even pick out the planet's shadow on the rings. The Altazimuth mount included with this telescope is light and easy to use; it may be the best choice for a young astronomer. If you want motorized tracking of the stars and planets, Orion's Spaceprobe 3 EQ is available with an equatorial mount, and Celestron sells essentially the same optical system with the computerized NexStar 76GT. -Jeff Phillips Pros: Best in class optical performance Two good Explorer II eyepieces Complete accessory package Cons: Small 76mm aperture Upside-down terrestrial images If you're looking for an affordable entry-level telescope for that beginning astronomy enthusiast, our SpaceProbe 3 Altaz is the perfect choice. Great for all-around stargazing, this highly portable, uncomplicated scope is just the right size and weight for the entire family, and just the right price for parents. This is a quality telescope, with a 3" (76mm) glass primary mirror mounted in a sturdy Neptune Blue Metallic aluminum tube. The rack-and-pinion focuser accepts standard 1.25" eyepieces. Two Explorer II eyepieces, a low-power 25mm (28x) and a high-power 10mm (70x), are included. An EZ Finder II finder scope mounted on the tube helps zero-in on the sky target. The altazimuth mount is lightweight and easy to use. To aim it, simply move it up or down or left or right. An adjustable, aluminum tripod with accessory tray is also included. One-year limited warranty. Features
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The Stars Efficacy
…THE STARS… The stars are giant nuclear reactors which is born when an enormous cloud of hydrogen gas collapses, until it is hot enough to burn nuclear fuels, which ends up to produce tremendous heat and radiation. The stars usually begin as a collapsing cloud of material composed primarily of hydrogen, helium through the process of nuclear fusion. The remainder of the star inferior carries energy away from the core through a combination of radioactive and connective processes. The stars internal pressure prevents it from collapsing further under its own gravity, once the hydrogen fuel at the core is exhausted, the stars having at least 0.4 times the mass of the sun expands to become a great giant. In some cases fusing heavier elements at the shells around the core, which then the stars evolves into a degenerate form, recycling a portion of the matter into the interstellar environment, where it will form a new generation of stars into a higher proportion of heavy elements. In the centers, atoms take part by atomic collisions that alter the atomic structure and release an enormous amount of energy. This makes stars hot and bright. In most stars, the primary reaction converts hydrogen atoms into helium atoms, releasing an enormous amount of energy. This reaction is called nuclear fusion, because it fuses the nuclei of atoms together forming anew nucleus. Historically, the stars have been important to civilization through out the world. They have been part of religious practices and for celestial navigation and orientation. In the 11th century, Abu Rayhan al-Burini described the Milky Way galaxy as multitude of fragments having the properties of nebulous stars and also gave the latitude of various stars during a lunar eclipse in 1019. William Herschel was the first astronomer to attempt to determine the distribution of stars in the sky. After a star has finished is active phase it becomes a white dwarf. In 1584, Giordana Bruno proposed that the stars were the objects like our sun. The first measurement of distance of stars was made by Friedrich Bessell in 1838 using the parallax technique, which Cygnus was measured to be 11.4 light years away. A red giant is as star in the process of fusing helium to form carbon and oxygen, if there is insufficient energy to make this happen, the outer shell of the star will shed leaving behind an inter core of oxygen and carbon, a remnant white dwarf. A star mass determines its luminosity, surface temperature, size and other properties as well as its evolutionary path and life time. The higher the mass, the brighter, the hotter, the larger, and shorter the life time of the star. If a star is larger than about 5 times the mass of the sun, when the hydrogen fusing stops, a super nova will take place and the rest of the material will condense into a black hole. Some stars have a surface temperature above 10,000 k or so; this star appear blue in our eyes and tends to be the hottest stars. Examples are the Eta-carinae, located about 7, 5000 light years from the sun. Eta-carinae could be as large as 180 times the radius of the sun and its surface temperature is 36,000 – 40,000 k which is about 72,000 df. A star in Orion, bellatrix, has a temperature of 21,500 k. That's even hotter; than Rigel which is in Orion also which temperature is 11,000 k. Astronomers classify stars by color using a series of letters; O, B, A, F, G, K, and M. O stars are the hottest, while M stars are the coolest and are red. B stars are blue, A stars are white, and G stars are yellow. The biggest stars in the universe are the monster red hyper giants, measuring up to 1,500 times the size of the sun. The smallest stars are the tiny red dwarfs. This are stars with 50% the mass of the sun and smaller, e.g. is the closest star to the earth Proxima centauri, located just 4.2 light years away. It has 12% the mass of the sun. The diameter is about 200,000 km. It is a little larger than Jupiter, knowing Jupiter is 143,000 km in diameter. Though this isn't the smallest star ever discovered. The smallest known star right now is the OGKE-TR-1225. A red dwarf star which is part of a binary stellar system. This star is only 20% larger than Jupiter. It is 100 times the mass of Jupiter, but is only a little larger. The largest known star is the VY Canis majoris. This star is thought to be 1,800 times the size of the sun; it will engulf the orbit of Saturn. According to Astrology, to which is the study of the movements and positions of the heavenly bodies in relation to their presumed influence upon human affairs, and is based upon an elaborate system of putative correspondences between celestial and mundane phenomena? The judicial branch of Astrology, deals with the foretelling events in individual lives by means of a horoscope, which involves the stars. Astrology is on of the most ancient belief. It prevailed from earliest times among the Chaldeans, Egyptian, Etruscans, Hindus, and Chinese. It had a powerful influence in the Europe of the middle ages. In the middle ages, astrology was brought to Europe by the Arabs and in the fifteenth century the ministers of the cult had become so powerful that no court is complete without is astrologer, and no monarch would dare to feast, fast, or fight unless assured that the stars were propitious. The first attempt to study the stars and to interpret their behavior was made by the Babylonians. Astrology then originated from the Babylonians and then passed to Greece, India, china, and the Islamic lands. Astronomy is the study of celestial bodies and the universe of which they form part, also helped to tell the effect of the stars. One of the most ancient of the sciences, naked-eye astronomy flourished in china, Babylonia, Egypt, and classical Greece. After the decline of ancient Greek culture, interest in astronomy was the preserve of the Arabs for many centuries and it was they who developed an instrument for observing the altitude of the celestial bodies and for solving other astronomical problems called the Astrolabe. European interest in the heavens, transmitted from the Arabs through Spain, reawakened in the 16th century with the work of Copernicus and Tycho, Brahe who were able to separate the science of astronomy from astrology. But it was not until 1609 Galileo's refracting telescope (invented in Holland in 1608) enabled the sky to be investigated in any detail; in 1671 Newton devised the more effective reflecting telescope. These devices provided the means for the development of descriptive astronomy, astronometry (the measurement of the position of celestial bodies), and celestial mechanics. In the 19th century, the use of spectroscopy to study the physical and chemical composition of the universe provided the basis of the new science of astrophysics and astrochemistry, Until the 1940s all observations of the heavens were made by observing the light that passed through the optical window in the atmosphere. Jansky's discovery (1932) that radio waves are emitted by celestial bodies enables the "radio window" in the atmosphere to be opened; with radio astronomy a whole new dimension was added to the investigation of the universe. With the uses of rockets, artificial satellites, space probes, and space observatories all restrictions on observation imposed by the atmosphere were enabling investigations to be made over the whole electromagnetic spectrum. But dependence on electromagnetic radiation as the source of information for astronomical investigations ended with the first moon landings and the unmanned planetary probes. This gradual evolution of astronomical instrument has been paralleled by far reaching changes in cosmology, which is known as the study of the origin, evolution, and structure of the universe. Betelgeuse is a monster star in the constellation Orion. Orion, who is often referred to as the "hunter", is also a prominent constellation located on the celestial equator and visible through out the world. It is one of the largest, most conspicuous, and most recognizable in the night sky. Orion includes the prominent asterism known as the belt of Orion, three bright stars in a row. Surrounding the belt at roughly similar distance are four bright stars, which are considered to represent the outline of the hunters body. Apparently descending from the belt is a smaller of three stars (the middle of which in fact not a star but the Orion nebula), known as the hunters sword. The belt and the sword of Orion are sometimes called Saucepan or Potin; by the Australians and the New Zealand respectively. The belt is called Drie konings (three kings) or the Drie susters (three sisters) by Afrikaans speaker in South Africa, and is referred to as les trios rois (the three kings). In the ancient Aram, the constellation was known as Nephila. Orion descendant were known as Nephilim. The stars were associated with Osiris, the god rebirth and after life; by the ancient Egyptians. Orion has also been identified with the last Egyptian pharaoh or the fifth dynasty called Unas, who according to the pyramid texts, became great by eating the flesh of his mortal and then slaying and devouring the gods themselves. This was based on a belief in contiguous magic whereby consuming the flesh of great people would bring inheritance of their power. After devouring the gods and absorbing their spirits and powers, Unas journey through the day and night sky to become the star Sabu or Orion. The pyramid text also shows that the dead the dead pharaoh was identified with the god Osiris whose form in the sky was often said to be the constellation Orion. Orion's current name derives from the Greek mythology in which Orion was a gigantic hunter of primordial times. One story tells that Orion was killed by a giant scorpion. The gods raised him and the scorpion to the skies, as Scorpio, Scorpius. Yet other stories told he was chasing the pleiad. The Indians refer Orion constellation as Mriga. According to the Nigerian myth, Orion is referred to as Ode (hunter). He was chasing the Pleiades, when he ran into a Yoruba land of the Niger area. He was arrested and locked in a dungeon with his two dogs; Aja nla (the big dog) and Aja kekere (the small dog). Which are called Canis Major and Canis Minor respectively in the Greek mythology? Orion was punished by the ruler of the Yoruba land called Sango (the god of fire). Orion became a servant, and followed Sango for his hunting's, with Ajanla and Aja kekere. Orion is usually depicted as a gigantic hunter with Yoruba attire and a local belt in his waist and a sword. Canis majoris was also used to guide the town Ile Ife, while Canis Minor was used to guide the palace of Sango, during a war. Sango then went for a war with his warriors, but unfortunately is warriors were all killed in the war. When Sango finally won the war, he was ashamed of the death of his warriors and decided not to return home. After three days of no return, Ode went looking for Sango, and found him. Sango told him to go tell the people that he his dead and will not return. Ode ran and told the chiefs of the village. The chiefs came to the war front and saw their men dead, they saw a man hanged and burnt with Sango charm on his neck, and thought he was Sango. They did a secret funeral for him. Sango prepared his journey to the heavens through transfiguration. Ode came back to the hiding place of Sango, and begged to follow him to the heavens, But Sango disagreed. As Sango was about to leave Ode held him on is heel and followed him. Ode couldn't pass the gates of heaven with Sango, so was stocked in the sky with is dogs, as a constellation. Canis Major in early classical Europe represented the dog Laelaps, a gift from Zeus to Europa, or sometimes the hound of Procris, Diana's nymph, or the one given by Aurora to Cephalus; Zeus elevated it to the sky because of its speed. The roman myth refers to Canis Major as Custos Europae, the dog guiding Europa. Canis Major contains Sirius (scorching star) the brightest star in the night sky, known as the Dog Star. Other stars in Canis Major are Adhara – the virgins, Wezen – the weight, Murzim – Announcer, Aludra – the virgin, Furud – the single one, Mulphin – dog's ear. While Orion stars are Betelgeuse, Rigel, and Bellatrix – Orion's left shoulder, Mintaka, Alnilam, Alnitak, Saiph – Orion's right foot, Hatsya – the tip of Orion's sword, Meissa – Orion's head. Orion was mentioned three times in the bible; at Job 9:9 – He is the maker of the bear and the Orion, Job 38:31 – can you loosen Orion's belt, Amos 5:8 – He who made the Pleiades and the Orion. Canis Minor is some times connected with the Teumessian fox, a beast turned into stone with its hunter, Laelaps, by Zeus who placed them in heaven as Canis Major and Canis Minor. Another constellation is the Eridanus, whose name is the ancient Greek name for Po River. It's the sixth largest constellation, the main river in Italy. Eridanus is depicted as a river flowing from the waters poured by Aquarius. Aquarius is a constellation in the southern sky, lying on the zodiac between Pisces and Capricornus. Aquarius is sometimes identified as Ganymede, a beautiful youth in Greek mythology with whom Zeus fell in love and in disguise of an eagle (represented by the constellation Aquila) carried off to Olympus to be cup bearer to the gods. Aquarius is also identified as Beniere (water goddess) by Nigerians. In the Nigerian myth Beniere is a river goddess who fell in love with a man who came to have is bath in the River Niger. She left the sea to be with this man, the man fell in love likewise. Beniere left the river to marry the man. She dwelt with him in a village called Angalabiri. After a long marriage and her husband knew the truth about her, he died of shock. After is death Beniere returned to the river. She was then pursued by her clan for what she did. She carried a cup and took the water of the sea and departed, and no one knew were she went. Years after the river Eridanus was to be the water she took from the sea and poured on a dry land. Eridanus was called by the Nigerians Oru toru Beni (the river of old). The stars can be said to form constellations which are remnant of the great ones of old. Soon some constellations will be out of the sky and new ones will fall in. In years to come, a constellation of Zeus, Dinosaur, and A Buddhist palm would be seen in the sky. When a Man is born, a star is born with him, this star represent the symbol of a soul in mortality. This star affects the life of is owner in various ways. The number of stars in our solar system determines the mortality in it. Therefore if they be no aliens, the number of stars is directly proportional to the population of man on earth. These stars are arranged yearly to us, and can be months or years in other planets. The stars are arranged surrounding the solar system, these stars is like a destiny, waiting to be experienced. As a planet passes its axis, it experiences what the stars read. A planet like Venus, is at an average distance of 108 million km, and is 12,102 km in diameter; orbits the sun 225 days. This planet is likely to repeat experiences, until the stars are rearranged. So the forward movement of a planet meets the future, if the planet is manipulated to move backward, it experiences its past. When a man dies, his star dies in return, or goes back to the galaxy, that's when you see a star falls out of the sky. They are star that live millions of years and man has no quality to live till such time. Therefore the probability of mortals living till such extent increases e.g. aliens. Some times a star falls of the sky, going to the galaxy after mans death indicates the probability of the man being reincarnated. This star is later assigned to him when he returns. The formation and evolution of the solar system is estimated to have begun 4.55 – 4.56 billion years ago, with the gravitational collapse of a small part of a giant molecular cloud. Most of the collapsing mass collected in the rest, flattened into a proto planetary disc out of which the planets, moons, asteroids, and other small solar system bodies formed. This widely accepted model known as the nebular hypothesis was first discovered in the 18th century by Emanuel Swedenborg, Immanuel Kant, and Pierra – Simon Laplace. A disk–shaped cloud of subsidiary smaller lumps, pieces, dust, gases e.t.c; orbiting the sun subsequently condensed to form the planets, satellites, asteroid, comets. It is thought that earth began as a cold world, and the very first atmosphere may have been hydrogen gas, but since that is so light weight and very chemically reactive, most of it would have floated off into space or reacted with other substance; thus would have been rapidly dissipated. The first real atmosphere is thought to be due to subsequent volcanic activity and other chemical reactions taking place. It is thought that the inner four solid planets may have been started out with similar atmosphere of H2O, CO2, CO, N2. According to the current thinking NH3 is now off the list because, it is so reactive that scientist believes it would have formed H2, which would have floated off into space and N2 which would have stayed in the early atmosphere. It's thought that these chemicals made up the atmosphere of earth for the first one billion years and initially provided similar atmosphere for the other three solid planets. Mars is said to be too far from the sun so is too cold. Any water and carbon IV oxide present are frozen solid in the ice cap; a tiny bit of CO2 thaws out and provides a thin atmosphere over portions of the planet during Martian summer. The planet is said to be too small to hold very much atmosphere and enough of a green house effect to keep the planet warm. Thus they is essentially no atmosphere over the next 3.5 billion years, the amount of carbon II oxide in our atmosphere was reduced as it became incorporated into rocks (limestone). The liquid oceans formed about 3.8 bya and life has been present for nearly as long. In the future to come the temperature of the sun would increase, the atmospheric clouds of Venus would be absorbed and Venus would seize to have rain. Mars seem to be too cold, as Earth started cold. Mars would sufficient sunlight to support life, while earth's ozone layer would diminish and earth would be exposed to a high temperature, which may lead to its destruction. Man live to adapt. This is called Evolution. Evolution is the gradual and continuous process by which the most primitive of living organisms have been developed into the diversity of plants and animal life known today. According to my thoughts, the proper reduction of the DNA of an organism would show its ancestors. According to John, a disciple of Christ, who was cast into a cauldron of boiling oil and escaped miraculously without an injury; was also banished and thrown to the Isle of patmos, where he wrote the book of Revelations A.D.96. In this book, he told a revelation on how the world would end. He used the stars in various ways. In rev 9:1 – And I saw a star fall from heaven into the earth; and to him was given the key to the bottomless pit. In this portion the star was said to turn to a person. A star was used in the location of Jesus, when he was born. They are beliefs that the stars would be liquefied and will fall on earth as brime stone, and few stars are like a hidden room where something special is kept. Few stars have been depicted as a mirror that faces the earth that the three witches of mortality uses in watching the universe. The stars is also said to be a transparent glass or a hole in the wall of heaven. The hole serves as a linkage to the underworld and to the heavens, while the transparent glasses are used to monitor or look through the other side of a world. In the bible Lazarus was carried to see the rich man in hell. The holes were what were used to see to hell. The star is more essential than a collapsing cloud of gases. The star has its physical and spiritual purposes on the Earth. …TARE-OTU IV…
About the Author
With a reflecting telescope is there any kind of image error due to the placement of the secondary mirror?
If the second mirror is right infront of the primary...i just dont understand. i never looked through a relector only a refractor.
If the mirrors are properly aligned, no. The primary is capturing so much light that the secondary blocks only a small portion and that blockage does not affect the image, only the amount of light falling on the eyepiece. Actually a reflector gives a truer image than a refractor because there is much less chromatic aberration.
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Orion Three-Fan Cooling System for Convex-Back Dobsonians
Sale Price: $59.99 |
DescriptionThis time-saving cooling system features three fans which have been custom designed to fit the Orion XX14g GoTo Dobsonian primary mirror cell. All three small fans work in tandem to help reduce the amount of time needed for the telescope to reach thermal equilibrium with the ambient air temperature of your observing location. You'll enjoy peak performance from your XX14g GoTo Dobsonian without having to wait as long for the air inside the telescope to cool down to the same temperature as your stargazing site. Consisting of three 12-volt DC, 0.12A fans which are wired in parallel, the Orion Three-Fan Cooling System for Convex-Back Dobsonians features a single 35" long power cable splitter for convenient use. Each fan boasts 33.4 CFM (cubic foot per minute) air flow to help significantly accelerate cooling of your Dobsonian telescope's optics. The fans operate quietly without vibrating, and they mount easily in threaded holes on the the XX14g primary mirror cell with included hardware. For best results, run the Orion Three-Fan Cooling System prior to using the reflector telescope. You can also use the cooling fans intermittently between observations to compensate for any ambient temperature changes that may occur. Power is supplied using the included battery holder which accepts 8 D-cell batteries (batteries not included). Since the Three-Fan Cooling System current draw is a low 0.36 amps, a full battery holder with 8 D-cells will provide over 24 hours of use. Features
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Bushnell Northstar 300 x 90mm Motorized Telescope w/ Real Voice Output
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Description1250 X 90MM MOTORIZED GOTO MAKSUTOV-CASSEGRAIN TELESCOPE4MM & 25MM EYEPIECESERECT IMAGE DIAGONAL MIRROR FOR LANDING VIEWGO TO COMPUTERIZED TRACKING TECHNOLOGYRED DOT LED FINDERSCOPEREMOTE HAND-HELD CONTROL MODULE WITH REAL VOICE OUTPUT CAMERA ADAPTABLEQUICK RELEASE TRIPODKINEMATIC MOUNTACCESSORY TRAYUPC : 029757788894Shipping Dimensions : 42.75in X 18.50in X 10.00inEstimated Shipping Weight : 47.6431 The NorthStar Telescope from Bushnell makes it possible for amateur astronomers to identify, locate, and track celestial objects with simple, push-button control. Combining high-quality optics with computer-driven location technology and a built-in database of 20,000 celestial objects, the NorthStar unveils the mysteries of the night sky. The telescope comes with a hand-held remote control module that allows you to call up your target by entering a simple "Go To" command. The NorthStar computer then locates the target, and once locked on to the target, tracks it automatically for prolonged viewing. Meanwhile, the innovative RVO (Real Voice Output) feature on the remote provides a fun, interactive way to explore the night sky. The telescope also features a 1x wide-angle, red dot, finderscope that allows the user to quickly sight in on areas of the sky and find objects quickly. The NorthStar Telescope comes complete with a quick-release tripod, kinematic mount, and an accessory tray for fast, easy assembly. Features and Specifications: 1250 by 90-millimeter Motorized GoTo Maksutov-Cassegrain Magnifications: 50x, 312.5x 4 and 25 millimeter eyepieces Erect image diagonal mirror for land viewing "Go To" computerized tracking technology Red Dot LED finderscope Remote hand-held control module with Real Voice Output (RVO) Camera adaptable Quick release tripod Kinematic mount Accessory tray Maksutov-Cassegrain Design This design utilizes a spherically curved front lens element in conjunction with a similarly curved primary mirror, providing sharp images in a compact folded-light path package. The total optical system provides a focal length much longer than the actual optical tube body length. "GO TO" Computerized Star Locator The Go To Star Locator utilizes an on-board computer and advanced motorized technology to allow you to quickly locate and automatically follow over 20,000 pre-programmed astronomical objects with the touch of a button. Educational descriptions of each object are also provided. Talking, Hand-Held, Remote Control Module The hand-held control module features red, backlit push buttons and a red, illuminated LCD read-out for easy viewing that won't impair your night vision. The talking feature of the remote describes the night sky with the touch of a button, in a real human voice. Kinematic Mount This simple yet high-precision altaz mount features three points of contact in both the horizontal and vertical planes for optimum shape, so that you can set up your view quickly, easily, and accurately. Features
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Orion LaserMate Pro Laser Collimation Kit
Sale Price: $99.99 |
DescriptionIf you'd like a collimator that stands up to the rigors of real-life field astronomy, our new LaserMate Pro Heavy Duty collimation kit is for you. Even if you dropped it into your bag, don't worry. Did you accidentally bang it? No problem. This hardened design will guarantee the alignment of the collimating laser for a lifetime. Collimation is the process of the mechanical centering of your optics to give your telescope the best possible optical performance. If you own a Newtonian reflector (especially an assemble-on-site telescope) it needs to be checked every time you reassemble it. For tack-sharp images through some telescopes, you may even need to check alignment during your nighttime viewing session as well. With the LaserMate Pro, you'll get a lifetime of precise collimation so you'll enjoy the best possible visual and imaging experience to get the most out of your telescope. Achieve quick collimation with laser precision in a simple two-step process. First, insert the LaserMate Pro into a standard 1.25" eyepiece holder and adjust the secondary to center the red laser dot on the primary mirror. For 2" eyepiece holders, use a 1.25" to 2" expansion adaptor or Orion's Precision Centering Adapter for greatest accuracy. Then, use the included Cheshire eyepiece for final collimation by tilting the reflector's primary mirror. Illustrated instructions and centering dots are included. The LaserMate Pro is built of durable metal in gunmetal grey and has a lifetime guarantee! Features
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Orion SkyScanner 100mm TableTop Reflector Telescope
Sale Price: $109.99 |
DescriptionAlthough perfect for beginning stargazers, this telescope is not a toy! The Orion SkyScanner 100mm TableTop Reflector is just the right size - large enough to see night sky objects yet compact enough to sit on a desk. The wide field of vision is ideal for observing detailed moon craters and even the spectacular rings of Saturn without having to leave town. Under darker skies, the SkySkanner has enough light-gathering power to reveal objects as deep as the Milky Way. Complete with 100mm parabolic primary mirror optics made of glass not plastic, two 1.25" eyepieces, and an EZ finder II reflex sight, this 100mm reflector provides up to 40x magnification out of the box and collects over 200 times more light than the unaided eye! Features
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Meade Light Shroud for 10-Inch LightBridge Truss-Tube Dobsonian.
List Price: |
DescriptionKeep out ambient light and help prevent dew from collecting on the secondary mirror with these convenient light shrouds. Features
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SkyScanner 100mm Reflector Telescope and Tripod Bundle
Sale Price: $189.99 |
DescriptionIf there isn't a table at your favorite observing spot, we now provide our Orion SkyScanner 100mm TableTop Reflector Telescope bundled with a sturdy field tripod so you can scan the skies anywhere! The included field tripod is adjustable with a height range of 20" to 34.5" so you can position the SkyScanner 100mm reflector for comfortable views in the field. The tripod also features an extendable elevator column for crowd-pleasing performance. The Orion SkyScanner 100mm Reflector and Tripod Bundle also includes a high-power 6.3mm eyepiece, which provides a powerful, 63x view in the 400mm focal length SkyScanner reflector for high-magnification views of lunar crater details, bright planets, and more. Although perfect for beginning stargazers, the Orion SkyScanner 100mm TableTop Reflector telescope is not a toy! It is just the right size - large enough to see night sky objects yet compact enough to be easily carried outside. The 100mm aperture reflector telescope's wide field of vision is ideal for observing the Moon and even the spectacular rings of Saturn without having to leave town. Under darker, more remote skies where the included field tripod will come in handy, the SkyScanner has enough light-gathering power to reveal objects as deep as the Milky Way. Complete with 100mm parabolic primary mirror optics made of glass not plastic, three 1.25" eyepieces, and an EZ finder II reflex sight, this 100mm reflector collects over 200 times more light than the unaided eye! Features
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Controlling the Primary Mirror in a Space-Based Telescope Utilizing an Eigenstructure Assignment Technique
Sale Price: $28.95 |
DescriptionThis is a AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH DEPT OF AERONAUTICS AND ASTRONAUTICS report procured by the Pentagon and made available for public release. It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A295624. The abstract provided by the Pentagon follows: The feasibility of using a sparse array of mirrors in a satellite system is being evaluated. This study focuse; on the control laws necessary for achieving the minimization of the effect of vibration which happens at the primary mirror of the satellite, by using the eigenstructure assignment technique. White Gaussian noise was assumed as the external input. AFRL has developed a 79 state model with 9 control inputs and 9 outputs, 3 sparse array mirrors, and a base. To extend the theory, a simplified model with 2 mirrors and a base which has 12 states, 4 control inputs and 8 outputs was developed. The system is not completely controllable nor observable because there are 4 rigid body modes. The control law starts from realizing the states which are controllable or uncontrollable. Then only for the controllable states, the eigenstructure assignment technique is applied. The closed-loop eigenstructure was determined by analyzing the open-loop modes. To find the best value for the eigenstructure, Newton's line search method was applied. The relative motions of the primary and secondary mirrors were described by wave reflection dynamics. Results show that this technique achieves a reasonable amount of control use for the objective and relates these result to those obtained from linear quadratic regulator (LQR) technique. |
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Orion SpaceProbe 3 Altazimuth Reflector Telescope
Sale Price: $99.99 |
DescriptionIf you're looking for an affordable entry-level telescope for that beginning astronomy enthusiast, our SpaceProbe 3 Altaz is the perfect choice. Great for all-around stargazing, this highly portable, uncomplicated scope is just the right size and weight for the entire family, and just the right price for parents. This is a quality telescope, with a 3" (76mm) glass primary mirror mounted in a sturdy Neptune Blue Metallic aluminum tube. The rack-and-pinion focuser accepts standard 1.25" eyepieces. Two Explorer II eyepieces, a low-power 25mm (28x) and a high-power 10mm (70x), are included. An EZ Finder II finder scope mounted on the tube helps zero-in on the sky target. The altazimuth mount is lightweight and easy to use. To aim it, simply move it up or down or left or right. An adjustable, aluminum tripod with accessory tray is also included. One-year limited warranty. Orion's surprising little Spaceprobe 3 has been picked by independent reviewers as one of the best telescopes in its price class. Unlike similar telescopes seen in discount stores, Orion has refined the Spaceprobe 3 by paying attention to the little details, and that make this telescope a great value. The Spaceprobe 3 comes with an unusually complete set of accessories. The package includes two very good Explorer II eyepieces (25mm and 10mm), an adjustable altazimuth tripod, a good red-dot finder, a student edition of "The Sky" planetarium program, and a well written manual. The package even includes the tools you'll need to assemble the telescope and align the optics. The Spaceprobe 3 is a Newtonian reflector. That means it uses mirrors instead of lenses. Newtonians are primarily used for astronomy because the images are upside-down. Orion includes a collimation tool and good directions for aligning the mirrors. The reward for aligning the mirrors is seen in images that snap into sharp focus. My Spaceprobe 3 arrived properly aligned right out of the box. With its Explorer II eyepieces, this telescope consistently delivers fine views. Using the 25mm eyepiece (28x magnification) the Pleiades cluster is simply wonderful, showing dozens of stars. From a rural location with a dark sky, the Orion Nebula is a big ghostly glow, and when I zoom in with the 10mm eyepiece, the Trapezium resolves into four tiny pinpoints. The double star Gamma Andromeda becomes two beads of light, one gold, the other one pale blue. Moon and planet images are crisp, with none of the false color I see in low cost refractors. When I look at the Moon I see mountains and terraced walls inside the larger craters. With the 10mm eyepiece (about 70x), Saturn's rings are sharply separated from the planet, and I can even pick out the planet's shadow on the rings. The Altazimuth mount included with this telescope is light and easy to use; it may be the best choice for a young astronomer. If you want motorized tracking of the stars and planets, Orion's Spaceprobe 3 EQ is available with an equatorial mount, and Celestron sells essentially the same optical system with the computerized NexStar 76GT. -Jeff Phillips Pros: Best in class optical performance Two good Explorer II eyepieces Complete accessory package Cons: Small 76mm aperture Upside-down terrestrial images Features
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Orion SpaceProbe 130 EQ Reflector
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DescriptionShips to the U.S. including Alaska, Hawaii, and Puerto Rico. Orion SpaceProbe 130 EQ Reflector Telescope An affordable but very capable telescope130mm aperture and 900mm focal length for great all-around viewing performanceIncludes sturdy tripod and equatorial mount for hands-free celestial trackingIncludes two eyepieces, finder scope, focuser, collimation cap, and FREE Starry Night astronomy softOne-year limited warranty A lot of folks shopping for their first telescope tell us that they have always had a fascination with the stars. They've been wanting to get a telescope for a long time, they say. We understand very well the lure of the night sky. It has intrigued mankind for millennia with its beauty and mysteriousness. And still does. So it's only natural to want to know more about it, to get a closer look. If you share this fascination, and are ready finally to spring for that telescope, then consider the affordable but very capable Orion SpaceProbe 130mm EQ Reflector Telescope. Sporting the classic long-tube Newtonian design, the Orion SpaceProbe 130mm provides great all-around viewing performance. One minute you can be studying lunar crater formations at high power; the next, the ethereal glow of a nebular star factory. A few minutes later, the ringed visage of Saturn. All served in crisp detail by way of the SpaceProbe's light-gathering 130mm (5.1") primary mirror of 900mm focal length (f/6.9). The mirror lies at the base of the rolled-steel optical tube, which is outfitted with a smooth rack-and-pinion focuser. It accepts 1.25" telescope eyepieces, including the two fully coated Explorer II telescope eyepieces that come standard with the Orion SpaceProbe 130mm: a 25mm for low-power viewing at 36x and a 10mm for higher-power looks at 90x. Also standard is a 6x30 achromatic finder scope to help home in on celestial targets. The mount is our sturdy EQ-2 equatorial model, with adjustable aluminum legs and accessory tray. Slow-motion controls allow fine The Orion SpaceProbe 130 EQ Reflector is a Newtonian reflector telescope packaged with a sturdy equatorial mount, two Explorer II eyepieces, a 6x30 finder scope, and Orion‘s Starry Night Special Edition software. Invented by Sir Isaac Newton, reflector telescopes provide more light gathering power per dollar than any other telescope design. With 130mm (5.1 inches) of aperture, the SpaceProbe 130 produces images that are twice as bright as 90mm telescopes and more than four times brighter than 60mm beginner scopes. The Orion SpaceProbe 130 EQ Reflector with its Explorer II eyepieces serves up bright, clear images of the Moon, the planets, and even deep space objects like star clusters and galaxies. The 25mm eyepiece magnifies the image by 36 times; when I look at the Pleiades or Seven Sisters cluster at 36X the SpaceProbe 130 shows me a bright open cluster with dozens of point-like stars filling the field of view. When I use the 10mm eyepiece (90X magnification) the lunar disk fills the field of view and the rings of Saturn are plainly resolved. And when I use an optional Ultima 2X Barlow with the 10mm eyepiece for 180X magnification I can see the cloud bands of Jupiter and pick out individual stars in bright globular clusters like M13. The EQ2 equatorial mount included with the Orion SpaceProbe 130 EQ Reflector comes partially assembled, but it shouldn’t take long to set up. The trick to using an equatorial mount is to point the polar axis at Polaris, the North Star. Once the mount is aligned and balanced, the telescope tracks stars and planets at high power with just a turn of one slow motion knob. You can even add an optional motor drive for hands free tracking. The Orion SpaceProbe 130 EQ Newtonian Reflector Telescope is a simply a great value. The Explorer II eyepieces deliver bright sharp images of the Moon, the planets and the stars, and the EQ2 mount can be motorized for hands free tracking. --Jeff Phillips Pros: More than 4 times brighter than 60mm scopes Includes two eyepieces and a 6x30 finder Solid equatorial mount and aluminum tripod Starry Night software and SkyTheatre DVD included Features
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Meade ETX60AT Telescope
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DescriptionTE2) ETX-80AT W/AUTOSTAR & TRIPOD Whether you want to study Saturn and its ring system, the primary cloud belts of Jupiter, or mountain ranges and other terrestrial objects, the Meade ETX-60AT offers extraordinary power for its price. It offers a 60mm multicoated, air-spaced achromatic objective lens manufactured with Grade A crown and flint optical glass components. The flip-mirror system lets you observe in the standard 90-degree position. Just flip the internal optical flat mirror up, and you'll be set for sky viewing.It's easy to carry, so you can take the Meade ETX-60AT to a distant mountaintop or to your own back yard. It only needs a quick 60-second alignment for setup. This telescope includes an Autostar hand controller that permits the automatic location of over 1,400 celestial objects. Just enter the object you wish to observe and watch as the telescope moves rapidly to place the object in your field of view. The Meade ETX-60AT also includes a serial interface, so you can download new software through your PC to the telescope. This way, the positions of Earth satellites may be updated for observation, or newly discovered objects, such as comets, can be located. Features
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