Orion 10" f/4 Newtonian Reflector Astrograph (replaces 8296) (10271)
10271
Orion 10" f/4 Newtonian Reflector Astrograph (replaces 8296) (10271)
10271
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Product Description
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.
What can I see with a Orion 10" f/4 Newtonian Reflector Astrograph (replaces 8296) (10271)?
Here are some simulated views of common objects. Results with your telescope will vary with viewing conditions, obrits, equipment and more.
Jupiter with
25mm Eyepiece - 40x Magnification
(Sold Separately)
Jupiter with
10mm Eyepiece - 100x Magnification
Sold Separately
Jupiter with
5mm Eyepiece - 200x Magnification
Sold Separately
Moon with 25mm Eyepiece
40x Magnification
(Sold Separately)
Moon with 10mm Eyepiece
100x Magnification
Sold Separately
Moon with 5mm Eyepiece
200x Magnification
Sold Separately
Andromeda with 36mm Eyepiece
28x Magnification
Sold Separately
Andromeda with 25mm Eyepiece
40x Magnification
(Sold Separately)
Andromeda with 10mm Eyepiece
100x Magnification
Sold Separately
What's in the Box
Specifications
| 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 |
|
| Other features |
|
| Warranty | One year |
