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Orion Telescopes
Orion 10" f/4 Newtonian Reflector Astrograph
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  • 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

Learn more
Item #  10271

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.


Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only. For complete warranty details contact us at 800-447-1001.

Product Support
Visit our product support section for instruction manuals and more
  • Best for viewing
    Fainter deep sky
  • Best for imaging
    Deep sky
  • User level
  • Optical design
  • Optical diameter
  • Focal length
  • Focal ratio
  • Optics type
  • Glass material
  • Eyepieces
  • Resolving power
  • Lowest useful magnification
  • Highest useful magnification
  • Highest theoretical magnification
  • Limiting stellar magnitude
  • Finder scope
  • Focuser
    3" dual-speed linear bearing Crayford
  • Secondary mirror obstruction
  • Secondary mirror obstruction by diameter
  • Secondary mirror obstruction by area
  • Mirror coatings/over-coatings
    Aluminum & Silicon Dioxide
  • Mount type
    Optical Tube without Mount
  • Astro-imaging capability
    Lunar, planetary & long exposure
  • Backfocus distance
  • Tube material
  • Length of optical tube
    38.4 in.
  • Weight, optical tube
    33.8 lbs.
  • Focuser height at zenith
    920 in.
  • 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

10" f4 optical tube assembly
8x50 finder scope and bracket
12V cooling fan (installed)
Pair of tube rings
2" extension adapter (35mm length)
Quick-collimation cap
Vixen-style dovetail mounting bar
2.5mm and 5mm Allen wrenches

Orders received by 1pm Eastern Standard Time for in-stock items ship the same business day. Order received after noon will ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.

A per-item shipping charge (in addition to the standard shipping and handling charge) applies to this product due to its size and weight. This charge varies based on the shipping method.

Standard Delivery: $0.00
Standard Delivery to Canada: $30.00
3 Day Delivery: $35.00
2 Day Delivery: $35.00
Next Day Delivery: $35.00

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