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Orion - Premium 190mm F/5.3 Mak-Newt Astrograph Telescope OTA - DISCONTINUED


Discontinued Product

Manufactured by: Orion

Orion - Premium 190mm F/5.3 Mak-Newt Astrograph Telescope OTA - DISCONTINUED


This is a discontinued item. We recommend the Orion 8" Ritchey Cretien Optical Tube as a replacement.


    • High-performance imaging telescope rivals apochromatic refractors, but at a fraction of the price


    • Large 190mm (7.5 inch) Maksutov-Newtonian optics deliver optically flat image, fast f/5.3 focal ratio


    • 2 inch Dual-Speed (11:1) Crayford focuser provides precise fine focus adjustments, and is compatible with the Orion AccuFocus Electronic Focuser (bracket 5049 required)


    • Larger 64mm secondary mirror increases field illumination for optimal use with larger CCDs



As one of our satisfied customers put it, the Orion 190mm Maksutov-Newtonian Astrograph Telescope gives "BIG APO Refractor-like performance at 1/3 the cost", not to mention the savings over smaller premium astrographs. But we didn't stop there -" further refinements have been made for even better imaging results!


Our improved 190 "Mak-Newt" Astrograph Telescope, with complete flat-field, coma-suppressed optics, will deliver stunningly crisp and colorful images of deep-sky phenomena to the eyepiece. From there, an all-machined dual-speed 2" Crayford-style focuser with 11:1 fine focus control will provide smooth motion and secure support for cameras and other heavy visual accessories. The focuser includes 2" and 1.25" compression ring adapters and is now compatible with our #7395 Orion AccuFocus Electronic Focuser when used with bracket # 5049. A T-thread adapter for direct attachment of a camera body (may require appropriate T-ring, sold separately) to the telescope's focuser, is also included.


The 190mm Maksutov-Newtonian Astrograph optics provide tremendous resolution in a fast f/5.3 design. The impressive 7.5" aperture ensures plenty of light-gathering ability in order to capture superb images of even the faintest of deep-sky gems. Attach a camera, such as the StarShoot Pro Deep Space Color Imager, and you're ready to start producing top-notch astrophotos in no time!


The primary mirror is made of high-grade, low-expansion optical glass with enhanced reflectivity coatings. This and the fully multi-coated BK7 meniscus lens combine to render truly spectacular images, with pinpoint stars across the entire field of view. The primary mirror and meniscus lens are now held in place even more securely, by three radially positioned nylon-tip set screws, to prevent any possibility of slippage or shifting. The 37.5"-long metal tube contains five knife-edge baffles for exceptional contrast.


The diameter of the secondary mirror has been enlarged from 58mm to 64mm, substantially increasing the field illumination to take full advantage of larger CCD chips, found in DSLR cameras and the Orion StarShoot Pro. The 100% fully illuminated field diameter increases from 14mm to over 22mm, producing brighter images with less vignetting.


Our Premium Mak-Newt Astrograph performs just as admirably visually. The included focuser extension adapter allows visual astronomers to enjoy the sharp, high-contrast views that only a well-made instrument can deliver. "Push the envelope" of your own imaging capabilities �" affordably �" with the improved Orion Premium 190mm Mak-Newt Astrograph Telescope. Optical tube only. One-year limited warranty.


One-year limited warranty.  


Product Specifications:


Use Astronomy


User level Advanced


Optical design Catadioptric


Optical diameter 190mm


Focal length 1000mm


Focal ratio f/5.3


Optics type Spherical


Resolving power 0.60arc*sec


Lowest useful magnification 27x


Highest useful magnification 300x


Limiting stellar magnitude 14.1


Optical quality Diffraction limited


Finder scope None


Focuser 2 inch Crayford


Secondary mirror obstruction 64mm


Secondary mirror obstruction by diameter 34%


Secondary mirror obstruction by area 11%


Mount style Optical Tube without Mount


Astro-imaging capability Lunar, planetary and long exposure


Tube material Aluminum


Length of optical tube 37.5 in.


Weight, optical tube 22.0 lbs.


Additional included accessories Brass compression ring, Low thermal expansion primary mirror, 2" to 1.25" eyepiece adapter


Other features 5 baffles for high contrast, Schott Glass Meniscus Lens, 11:1 Fine Focus adjustment


Warranty One year


Included Items:


Premium 190mm f/5.3 Maksutov-Newtonian Astrograph OTA


2"-to-1.25" eyepiece adapter


focuser estension (for visual use)

Additional Information

Name Orion - Premium 190mm F/5.3 Mak-Newt Astrograph Telescope OTA - DISCONTINUED
Manufacturer Orion
Model 09978
Discountinued Yes