The Orion 10″ f/4 Newtonian Reflector Astrograph offers an affordable, fast astrograph with immense light-gathering ability.
The telescope offers a 250mm (9.8″) parabolic primary mirror which is made of low-thermal-expansion BK7 glass. The 1,000mm 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 offers 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 included with the Orion 10″ f/4 Newtonian Reflector Astrograph are two cast aluminum tube rings, an 8×50 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.
You can learn more about the Orion 10″ f/4 Newtonian Reflector Astrograph here.
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