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| Comparison Shopping - Home » Cameras » Telescopes and Microscopes » Telescopes » Orion 10" f/3.9 Newtonian Astrograph Reflector Telescope | |
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| Orion 10" f/3.9 Newtonian Astrograph Reflector Telescope |
 | Our largest reflector optimized for astro-imaging boasts 10-inch parabolic primary optics with a very fast f/3.9 focal ratio for exceptional wide-field, deep-space imaging performance. Even faint galaxies and nebulas exhibit stunning detail with limited exposure time when photographed through this large-aperture astrograph with a CCD imager or DSLR camera. You'll get incredibly bright, crisp images that will make apo refractor aficionados green with envy - and you'll have more green in your wallet thanks to this telescope's more-affordable Newtonian design. Both the 10-inch (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-inches in front of the focuser blocks intrusion of off-axis light, ensuring optimum image contrast. |
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