Orion 10" Newtonian Reflector Astrograph

Product Details

• Description
• Specifications
• Included Items
• Recommended Products
• Reviews

• 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.

• 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

• included items

  • 8x50 Finder Scope,
  • Hinged Tube Rings,
  • 2" Extension Adapter for Visual Use
  • Quick-Collimation Cap