![]() A steel reinforcing plate directly under the focuser eliminates flexure between it and the tube. 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. The mirror is center marked to aid in precise collimation, and a quick-collimation cap is included. 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 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 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). Our 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. Relative to premium refractors of even half its aperture, this 10" scope's affordable price makes it a terrific value. This imaging powerhouse reveals dim objects as astonishingly bright with just minimal exposure times of your DSLR or astronomical camera. Super affordability compared to premium "apo" refractors with half the aperture of this astrophotographic dream scopeįor the serious astrophotographer seeking a fast astrograph with immense light-gathering prowess, our 10" f/4 Newtonian Reflector Astrograph should top your wish list. ![]() A coma corrector (sold separately) is recommended for optimal flat-field performance. Accessories include an 8x50 finder scope, hinged tube rings, 2" extension adapter for visual use, and quick-collimation cap.Big 3" dual-speed linear bearing Crayford focuser is made of machined (not die-cast) aluminum and accepts both 2" and 1.25" accessories.The 10"-class parabolic primary mirror boasts enhanced aluminum coatings on primary and secondary mirror that provide >92% reflectivity. ![]()
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