Orion 10" f/4 Newtonian Reflector Astrograph Telescope - 10271

• Capture more photographic detail in less time with this fast f/4 imaging powerhouse
• The 10"-class parabolic primary mirror boasts enhanced aluminum coatings on primary and secondary mirror that provide >92% reflectivity
• Big 3" dual-speed linear bearing Crayford focuser is made of machined (not die-cast) aluminum and accepts both 2" and 1.25" accessories
• Accessories include an 8x50 finder scope, hinged tube rings, 2" extension adapter for visual use, and quick-collimation cap. A coma corrector (sold separately) is recommended for optimal flat-field performance.
• Super affordability compared to premium "apo" refractors with half the aperture of this astrophotographic dream scope

For the serious astrophotographer seeking a fast astrograph with immense light-gathering prowess, our 10" f/4 Newtonian Reflector Astrograph should top your wish list. 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.

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. 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.

• Best for viewing

  Fainter deep sky

   
• Best for imaging

  Deep sky

   
• User level

  Advanced

   
• Optical design

  Reflector

   
• Optical diameter

  250mm

   
• Focal length

  1000mm

   
• Focal ratio

  f/4.0

   
• Optics type

  Parabolic

   
• Glass material

  BK-7

   
• Eyepieces

  None

   
• Resolving power

  0.46arc*sec

   
• Lowest useful magnification

  36x

   
• Highest useful magnification

  300x

   
• Highest theoretical magnification

  500x

   
• Limiting stellar magnitude

  14.7

   
• Finder scope

  8x50

   
• Focuser

  3" dual-speed linear bearing Crayford

   
• Secondary mirror obstruction

  88mm

   
• Secondary mirror obstruction by diameter

  35%

   
• Secondary mirror obstruction by area

  12%

   
• Mirror coatings/over-coatings

  Aluminum & Silicon Dioxide

   
• Mount type

  Optical Tube without Mount

   
• Astro-imaging capability

  Lunar, planetary & long exposure

   
• Backfocus distance

  92.4mm

   
• Tube material

  Steel

   
• Length of optical tube

  38.4 in.

   
• Weight, optical tube

  33.8 lbs.

   
• Additional included accessories

  12V cooling fan with battery pack (req. 8 AA), Pair of hinged, felt-lined tube rings, 2" extension tube for visual use

   
• Other features

  Center-marked primary mirror for collimation

   
• Warranty

  One year

   
• Focuser height at zenith

  920 in.