Orion 8" F/3.9 Newtonian Astrograph
Orion's 8" aperture deep-sky imaging specialist boasts features usually reserved for much pricier astrophotography telescopes. In fact, the Orion 8" f/3.9 Newtonian Astrograph's powerful imaging performance easily exceeds what's achievable with many premium apo refractors costing thousands of dollars more.
Its 8" parabolic primary mirror has 800mm of focal length, making the fast f/3.9 Newtonian an ideal wide-field astrophotography telescope. A substantial 70mm minor axis secondary mirror provides full field illumination to CCD and/or DSLR cameras for efficient astrophotography performance. This provides less than 10% light drop-off around the corners of very large APS-C sized sensors. Both primary and secondary mirrors boast enhanced reflectivity (94%) aluminum coatings with a protective silicon dioxide (quartz) overcoat. Three easy-grip, push-pull collimation hand knobs on the primary cell make collimation adjustments easy. Once aligned, three locking thumbscrews secure the 8" parabolic mirror.
Images acquired with the 8" f/3.9 Newtonian Astrograph will exhibit maximum contrast thanks to sophisticated telescope features any astrophotographer will appreciate. Nine precisely positioned baffle rings along the inside of the reflector optical tube minimize internal reflections of pesky off-axis light for pristine imaging performance. To further optimize contrast and avoid off-axis light intrusion near the front of the telescope, the dual-speed 2" Crayford focuser has been installed a full 6.3" back from the front of the 30" long reflector optical tube. What's more, the entire inside of the rigid, rolled steel optical tube is coated with high-quality flat black paint to ensure high contrast.
The reflector telescope's low-profile Crayford-style focuser has a full 69mm of backfocus, making it ideal for use with multiple imaging accessories. The smooth-adjusting focuser is held rigidly in place without any possibility of flexure thanks to a sturdy internal steel reinforcing plate. With fine focus adjustment capabilities at a ratio of 11:1, the smooth focuser is a joy to use and makes it easy to perform minute focus adjustments. Drawtube tension is adjustable, so you can customize focuser tension according to the load of astrophotography accessories being used.
As with any fast Newtonian reflector telescope, an optional coma corrector is recommended to eliminate inherent coma for optimized imaging performance. When used with a coma-corrector, the 8" Newtonian Astrograph will astound you with the amount of depth and resolution seen in astrophotos with round stars all the way out to the edges of the substantial field of view.
The 8" Newtonian Astrograph can also be used for spectacular visual observations of deep-sky and solar system based celestial objects. The reflector's 8" aperture and fast focal ratio will amaze you with high-contrast views of the cosmos. Handy extension adapters are included for optimal use of 2" and 1.25" telescope eyepieces.
A thorough complement of accessories comes with the 8" f/3.9 Newtonian Astrograph telescope. Standard accessories include a cooling accelerator fan for speedy temperature equilibration, a pair of cast aluminum tube rings equipped with both upper and lower 1/4"-20 mounting holes, quick collimation cap, and a 9x50 finder scope. Eight AA batteries (not included) are required for cooling accelerator fan operation, or a portable 12V power supply (sold separately) can be used.
With a weight of just 17.5 lbs. by itself, and 21.8 lbs. with the included accessories installed, the Orion 8" f/3.9 Newtonian Astrograph can be supported easily by most equatorial mounts designed for astrophotography use.
Manufacturer Product Number: 08297
- Additional Information
SKU OR-8297 Manufacturer Orion Telescope Series Orion Optical Tube Assemblies Optical Design Newtonian Reflector Mount Type None - Optical Tube Only Warranty 1 Year Warranty Telescope Aperture 8" Telescope Focal Length 800mm Telescope Focal Ratio f/3.9 Highest Useful Magnification 300x Limiting Stellar Magnitude 14.2 Optical Tube Outer Diameter 203mm Length of Optical Tube 30.0 in. Optical Tube Weight 17.5 lbs. Alignment Procedure Manual Alignment Focuser Size 2" Focuser Style Crayford Focusing Speeds Two-Speed Manual or Electronic Focusing? Manual Tripod Type Included None, Sold Separately CD ROMs Included Starry Night SE Power Adapter Included None - Requires AA Batteries Finder Included 9 x 50 Optical Finder
- Included Items
- 8" f/3.9 Newtonian Astrograph reflector telescope optical tube
- 9x50 Finder scope
- Cooling accelerator fan and battery pack
- 2 Hinged tube rings
- 2" & 1.25" Extension adapters (for visual use)
- Starry Night Special Edition astronomy software
- Instruction manual
- Collimation cap
- Questions & Answers
Product QuestionsHi, I need to know which type of focal reducer (listed below) could be used by judging from the back focus?
1) ASA 2-inch Newton Coma Corrector and 0.73x Reducer for Astrophotography, 2) Baader 2" Newtonian Coma Corrector MPCC Mark III - from f/3,5 to f/6, 3) Baader RCC Newton Coma Corrector - triplet lens - long distance. Then, I would like to know the distance from the focuser end to the focal plane. Thanks!Question by: Atsushi Yokota on Dec 1, 2015 12:28:00 AMThe MPCC and RCC correctors will work with this scope as they are 1x and do not move the focal point inward. The 0.73x reducer may work, but you may need a lower profile focuser as it moves the focal plane inward by ~15-16mm plus a back focus needed of ~65mm (eating up ~80mm of back focus). The MPCC has a back focus of 55mm and the RCC has a back focus of 91.5, so the RCC will need to be dropped farther into the focuser to correct the image.Answer by: Chris Hendren (Admin) on Dec 1, 2015 11:45:00 AMQuestion by: stevelenti on Jan 1, 2015 6:27:46 AMHello Steve,
Thank you for your question. There indeed is. The best way to do that would be to get the ADM Losmandy Dovetail to Vixen Style Saddle Plate.
This plate has a Losmandy style base which is inserted into a mount with a Losmandy D style saddle. On the top of this plate is a Vixen style saddle which will accept telescopes with a Vixen style dovetail plate like this Orion 8" Newtonian.Answer by: Roderick (Admin) on Jan 4, 2015 12:04:31 PM
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