Product Overview
Used Orion 10" F4 imaging Newtonian telescope. - No Box
The mount shown has been sold and is not included.
For the serious astrophotographer seeking a fast astrograph with immense light-gathering prowess, the Orion 10" Newtonian Reflector Astrograph is an all-around excellent choice. This imaging powerhouse reveals dim objects as astonishingly bright with just minimal exposure times of your DSLR or astronomical camera. Relative to premium refractors of even half its aperture, this 10" scope's affordable price makes it a terrific value.
The 10" f/4 Newtonian Reflector Astrograph's 250mm (9.8") parabolic primary mirror is made of low-thermal-expansion BK7 glass, which is superior to standard soda-lime glass. The 1000mm focal length is ideal for framing a wide variety of celestial targets! The enhanced aluminum mirror finish has 92% to 95% reflectivity and is coated with a protective layer of SiO2 (quartz). The 88mm minor axis secondary mirror provides excellent full-field illumination with modern cameras, with minimal light drop-off at the edge of APS-C sized sensors. The rear cell features large collimation knobs and a built-in fan to speed cooling of the mirror (requires 8 AA batteries, not included). The mirror is center marked to aid in precise collimation, and a quick-collimation cap is included.
The machined 3" dual-speed (10:1) Crayford focuser boasts a linear bearing design, which adds rigidity to the drawtube to support heavier imaging loads. A steel reinforcing plate directly under the focuser eliminates flexure between it and the tube. The focuser's 2" collar accepts 2" accessories and comes with a 1.25" eyepiece adapter, both with non-marring compression ring clamps. A 2" extension adapter (35mm length) is included for visual observation.
Additional standard accessories include two cast aluminum tube rings, an 8x50 crosshair finder scope, and dust cap. As with any fast Newtonian, a coma corrector (sold separately) is recommended to achieve flat-field imaging performance. Backfocus distance is 92.4mm from the 2" drawtube collar. Weighs 33 lbs., 12 oz.
Sold as a final sale. Please refer to our used policy. https://ontariotelescope.com/return-policy/
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specifications
Aperture 254mm (10") Back Focus 92.4 mm Dawes Limit 0.46 arcseconds Focal Length 1000mm Focal Ratio f/3.9 Glass Type 7 Highest Magnification 508x Light Gathering Power 1317x Optical Design Newtonian Secondary Obstruction 82 mm/ 2.5 inches Tube Diameter 250mm Tube Length 968mm Tube Weight 34.1 lb
