Description
Orion 8″ f/4 Newtonian Reflector Astrograph
Discover the universe with the Orion 8″ f/4 Newtonian Reflector Astrograph, a telescope designed to meet the needs of both intermediate and advanced astrophotographers. This powerful instrument combines exceptional optical performance with user-friendly features, making it an ideal choice for capturing stunning images of the night sky.
Exceptional Optical Performance
At the heart of this astrograph is an 8-inch (200mm) parabolic primary mirror, crafted from high-quality BK7 glass. This mirror, with its enhanced aluminum coatings, delivers over 92% reflectivity, ensuring bright and vivid images. The fast f/4 focal ratio is perfect for astrophotography, allowing for shorter exposure times and capturing intricate details of faint celestial objects.
Wide Field of View
With an 800mm focal length, the Orion 8″ f/4 provides a wide field of view, making it ideal for deep-sky imaging. Whether you’re photographing expansive star clusters or intricate nebulae, this telescope offers the clarity and detail you need to produce breathtaking images.
Precision Focusing
The dual-speed Crayford focuser, featuring a 2″ focuser with 10:1 fine focus control, allows for precise adjustments. This is crucial for achieving sharp, detailed images, especially when working with high-resolution cameras.
Portability and Ease of Use
Weighing only 16 lbs and measuring 28 inches in length, this telescope is both lightweight and compact. Its portability makes it easy to transport to your favorite dark-sky locations, ensuring you can capture the best possible images wherever you go.
Rapid Cooling
The included 12V DC cooling accelerator fan helps the primary mirror reach thermal equilibrium quickly, ensuring stable imaging conditions. This feature is particularly useful for those long nights of astrophotography, where maintaining optimal conditions is key.
Complete Package
The Orion 8″ f/4 comes with essential accessories, including an 8×50 finder scope, hinged tube rings, and a quick-collimation cap. For those looking to achieve the best possible imaging performance, a coma corrector is recommended (sold separately).
Versatility
While primarily designed for astrophotography, this telescope is also suitable for visual observations with the addition of an optional eyepiece. This versatility makes it a valuable tool for any astronomy enthusiast.
Whether you’re capturing the delicate structures of distant galaxies or the vibrant colors of nebulae, the Orion 8″ f/4 Newtonian Reflector Astrograph is your gateway to the cosmos.
Specifications for the Orion 8″ f/4 Newtonian Reflector Astrograph:
Specification | Details |
---|---|
Best for viewing | Fainter deep sky |
Best for imaging | Deep sky |
User level | Advanced |
Optical design | Reflector |
Optical diameter | 200mm |
Focal length | 800mm |
Focal ratio | f/4.0 |
Optics type | Parabolic |
Glass material | BK-7 |
Eyepieces | None |
Resolving power | 0.58 arc*sec |
Lowest useful magnification | 29x |
Highest useful magnification | 300x |
Highest theoretical magnification | 400x |
Limiting stellar magnitude | 14.2 |
Finder scope | 8×50 |
Focuser | 2″ dual-speed linear bearing Crayford |
Secondary mirror obstruction | 70mm |
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 | 83.2mm |
Tube material | Steel |
Length of optical tube | 27.5 in. |
Weight, optical tube | 16.0 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 |
What’s in the box:
8″ f4 optical tube assembly
8×50 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
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