Orion 10 f/3.9 Newtonian Astrograph Reflector telescope

Description

Both the 10″ (254mm) primary and secondary mirror feature enhanced reflectivity (94%) aluminization for bright, contrast-rich images. The 82mm minor axis secondary mirror provides excellent full-field illumination with modern CCD imagers and DSLR cameras, with less than 8% light drop-off at the edge of APS-C sized sensors. The adjustable 4-vane secondary mirror holder features very thin, 1mm thick spider vanes to minimize diffraction effects in images. A center mark on the primary mirror and three easy-grip collimation knobs make optical alignment easy and precise.

Extended tube length of 7.5″ in front of the focuser blocks intrusion of off-axis light, ensuring optimum image contrast. The sturdy 2″ dual-speed (11:1), low-profile Crayford focuser permits ultra-fine focus and has 38mm of drawtube travel and a helpful drawtube lock knob. A steel reinforcing plate bolted inside the 38.6″ long tube directly under the focuser helps eliminate flexure between it and tube, even with heavy imaging gear attached.

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