telescope 900mm
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BUSHNELL 789946 VOYAGER(R) SKY TOUR(TM) 900MM X 4.5" REFLECTOR TELESCOPE
Sale Price: $260.96  |
Description900MM X 4.5" REFLECTOR TELESCOPE; LCD HANDSET; ILLUMINATED SMART MOUNT; LED RED DOT FINDERSCOPE FOR FAST POSITIONING ; STURDY PREASSEMBLED CONSTRUCTION; FULLY ADJUSTABLE, QUICK-RELEASE TRIPOD; THREE 1.25" EYEPIECES (4MM, 8MM & 12.5MM) |
Best magnification for novice planetary observation?
My roommate just got a 6-inch Dobsonian telescope with a focal length of 900mm. It comes with a 25mm Plossl eyepiece for 36x. For now he wants to get by on only two eyepieces total. If you were in his shoes what magnification would you get for looking at the planets?
It depends on how big I want the planets to look. The easiest way to look at planets will be at low magnification such as 36x. If you want to see surface details on Jupiter, 75x or even lower will already reveal the 2 equatorial bands. The rings on Saturn will also reveal the gap between the ring and planet at this magnification. The answer is really on how you want it to look and how often do you want to reposition your dobsonian telescope. Higher magnification means you have to move your telescope more often.
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US $254.17
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BUSHNELL 789946 VOYAGER(R) SKY TOUR(TM) 900MM X 4.5" REFLECTOR TELESCOPE
Sale Price: $260.96 |
Description900MM X 4.5" REFLECTOR TELESCOPE; LCD HANDSET; ILLUMINATED SMART MOUNT; LED RED DOT FINDERSCOPE FOR FAST POSITIONING ; STURDY PREASSEMBLED CONSTRUCTION; FULLY ADJUSTABLE, QUICK-RELEASE TRIPOD; THREE 1.25" EYEPIECES (4MM, 8MM & 12.5MM) |
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Night Owl Pro Nexgen Night Vision Binocular (5x)
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DescriptionNight Owl NOB5X 5.0x NexGen Night Vision Binoculars with 50mm Lens The highest magnification binocular available, Night Owl Optics' 5-power binocular is an advanced, highly acclaimed generation-1 binocular. The aesthetics, ergonomics, and performance of this instrument are high-quality and recommended by the manufacturer for those who demand the highest performance that generation-1 technology can offer. A central focusing wheel allows for quick and easy focusing of both objective lenses simultaneously. And Night Owl's proprietary interocular hinge guarantees you that both optical channels are always centered precisely over each eye. Features: 5x magnification Adjustable focus with central focusing mechanism Two high-quality generation-1 image intensifier tubes Adjustable interocular distance centers the dual optical channels precisely over each eye Built-in columnated infrared illuminator for use in complete darkness or to improve target recognition in any environment Objective and ocular lenses constructed of high-quality all-glass optics Soft-touch rubberized finish Impact-resistant molded thermoplastic lens housings Padded neck strap Specifications: Magnification: 5x Objective Optic Design: manual focus Lens Diameter: 50 mm Resolution: 35 lp/mm on center Spectral Sensitivity: 400 nm to 900 nm Diopter adjustment: +4 to -4 Interocular distance: adjustable from 57 mm to 73 mm Minimum Focal Distance: 3.6 feet (1.1m) Angular Field of View: 12.5 degrees Field of View at 200 ft. distance: 44 feet wide (61m / 13.4m) Dimensions: 8.00 by 5.85 by 2.60 inches (L x W x H) Weight, without batteries: 38 ounces Power Supply: requires (1) 3-volt Type-123 lithium battery (not included) Battery Life: 40 to 80 hours, depending on infrared usage. Infrared Illuminator, built-in Features
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Vivitar Telescope with Tripod
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DescriptionVivitar Telescope with Tripod 50-600DG Features
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Barska Starwatcher Telescope
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DescriptionThe Barska® Starwatcher telescope is an ideal entry-level telescope for the aspiring amateur astronomer. It is easy to set up and includes everything necessary to begin the adventure of a lifetime, including telescope, finderscope, eyepieces, mount and tripod. Each Starwatcher telescope also includes the Beginner's version of the popular Deepsky Astronomy Software, which includes a searchable database of over 10,000+ objects. |
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Orion SpaceProbe 130 EQ Reflector
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DescriptionThe 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 Orionâs 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 Ships 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 Features
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Orion Aristocrat 60 Brass Refractor
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DescriptionOrion Aristocrat 60mm Brass Refractor Telescope An excellent telescope for both astronomical and terrestrial viewing60mm aperture and 900mm focal length for sharp, long-range viewingIncludes an extendable tripod crafted from fine African mahogany and a stable all-brass cradle mountIncludes eyepiece, finder scope, focuser, diagonal, and FREE Starry Night astronomy softwareOne-year limited warranty A classical masterpiece reborn for a modern age, this Orion Aristocrat 60mm Brass Refractor Telescope is as mesmerizing to gaze at as is to gaze through. Handcrafted from solid brass and African mahogany, this exclusive instrument adds the perfect accent to any lakefront Victorian, balconied loft in the city, or 3-bedroom with den in the suburbs graced with a scenic view of land, sea, or sky. Elaborately detailed with a 6x30 correct-image finder scope, cradle mount, rack-and-pinion focuser, and stabilizing chain-all made of polished brass-this stunning beauty comes with a correct-image 45° diagonal and an interchangeable 25mm (36x) Plossl telescope eyepiece (1.25"). Additional telescope eyepieces for higher magnifications are available separately. The 100% brass optical tube houses a fully coated achromatic refractor lens system designed for sharp images, whether focused on distant terrestrial subjects or on the rings of Saturn. The brass mounting allows smooth movement of the telescope in any direction. Extendable tripod legs, crafted from laquerered African Mahogany, are trimmed with polished brass joints and lock collars. And the final tripod touch: a brass placard engraved with the Aristocrat name. For yourself or as a holiday gift for someone special, an Orion Aristocrat 60mm Brass Refractor Telescope will make a lasting impression of quality and elegance. This item cannot be shipped internationally due to its size and weight. Features
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Tube Assembly, 100mm ED Apochromatic Refractor, Orion (1-Box Only)39x9x9
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DescriptionOrion Tube Assembly - 100mm - You could pay more than $2,500 for a premium 4" refractor from one of those "boutique" telescope outfits, but here's something more practical: our 100mm ED apochromatic refractor. It's the best value in high-end portable refractors we've ever offered. -- The ED100 delivers images remarkably free of chromatic aberration, thanks to its fully multi-coated 100mm objective doublet. It's crafted with one element of FPL-53 extra-low dispersion "ED" optical glass from Japan. The 100mm aperture gives it 56% greater light grasp than our ED80. The 900mm focal length (f/9.0) is ideal for visual planetary and lunar study and also excels for imaging work. -- The baffled, 36"-long aluminum tube is outfitted with a 2" Crayford-style focuser for exceptionally smooth focusing with no backlash. It accepts both 2" and 1.25" diagonals. A molded-in dovetail base accepts any Orion finder scope. Weighs 7 lbs. Features
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Celestron 21061 AstroMaster 70 AZ Refractor Telescope
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DescriptionTE3)CELESTRON ASTROMASTER 70AZ SCOPE Features
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Celestron 21037 PowerSeeker 70EQ Telescope
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DescriptionOpen up the wonders of the universe with the Celestron(r) 21037 PowerSeeker 70EQ telescope. It is designed for quick and easy use to give the first-time telescope user a combination of features and power. |
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Celestron 21062 AstroMaster 70 EQ Refractor Telescope
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DescriptionCelestron’s AstroMaster 70 EQ combines the solid optical performance of a classic achromatic refractor with a German style equatorial mount. The Astromaster 70 features easy no-tool setup and much better optics than 60mm beginner scopes. The Astromaster package includes high and low power eyepieces, a correct image diagonal prism, illustrated instructions, and planetarium software for your PC. The AstroMaster 70 EQ features very good optical performance. Achromatic refractors have a two piece objective lens, the second lens element compensates for “chromatic aberration”, the false color or blue fringes seen in low cost telescopes. In daylight tests I see very little blue fringing with the standard equipment 10mm eyepiece (90X magnification), and none at all with the 20mm eyepiece (45X). Stars and planets show up very nicely with the AstroMaster 70. The bright double star Castor, one of the “twins” in the constellation Gemini, is cleanly split at 90X with the 10mm eyepiece. When I tried an optional 6mm Plossl eyepiece for a magnification of 150X, I was treated to lovely views of Saturn’s rings and the little orange disk of Mars. My view of the Moon was delightfully crisp and clear; the 20mm eyepiece nicely frames the Lunar disk, and using the 10mm eyepiece I could easily see mountain peaks and terraced walls inside the crater Copernicus. The AstroMaster 70 EQ also features a newly designed tripod with 1.25 inch stainless steel legs. This new tripod holds the telescope firmly; I had no trouble focusing even with a high power eyepiece. The equatorial mount is a little more complicated to balance and align than the AstroMaster 70 AZ , but the reward is better slow motion control and tracking at magnifications over 100X. Simply point the equatorial axis at Polaris, the North Star, and the telescope tracks celestial objects by turning one slow motion knob. This makes it much easier to use a high power eyepiece while viewing the Moon and Planets. The “star pointer” finder scope works by shining a red LED on a plastic window; just look through the window and line up the red spot with your target. This works OK for bright objects like the Moon and planets but not so well for finding galaxies and deep space objects. The AstroMaster 70 EQ is a very good entry level telescope for a student or family. The good quality 70mm optics produce an image that is significantly sharper and brighter than 60mm beginner scopes, and the AstroMaster 70 EQ includes a solid mount, two good eyepieces, and fully illustrated instructions. --Jeff Phillips Pros: Reliable refractor design Good views of the Moon and planets Complete accessory package Simple no tool setup Cons: Star-pointer not so easy to use Celestron AstroMaster 70EQ 45 - 90X Refractor Telescope with Equatorial Mount. Affordable, powerful, lightweight... the perfect choice for amateur astronomers and backyard stargazers! Proving once again that you don't need NASA's budget to see the stars. If you're aiming to get started in astronomy, the AstroMaster 70EQ's blend of quality optics, entry-level usability and affordable price is tough to beat. It's lightweight, easy to haul to the darker skies found outside city limits, and requires no tools to set up. For celestial and "earthbound" observation on a dime, the Celestron AstroMaster outshines the rest! Specifications: German Equatorial mount with setting circles to accurately locate and track sky objects; 70 mm aperture size; Includes 20 mm eyepiece for 45X magnification, 10 mm eyepiece for 90X; Refractor optical design; Fully-coated glass optics with high-transmission coatings for enhanced brightness and clarity; Built-in StarPointer red laser for easy targeting; Comes with The Sky X Planetarium software, featuring a 10,000 object database to get you started; Focal length: 900 mm; Focal ratio: 12.86; Limiting stellar magnitude: 11.7; Light-gathering power: 165X; Angular F.O.V.: 1.1 degrees; Linear F.O.V.: 58'; Optical tube length: 36"; 1.25" erect image diagonal; Weighs 18 lbs. Includes aluminum tripod with 1.25" steel tube legs. Order yours today! Celestron AstroMaster 70EQ 45-90X Refractor Telescope Features
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