20" f/8 truss tube Ritchey-Chrétien optical tube

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Focal Ratio:
This is the ‘speed’ of a telescope’s optics, found by dividing the focal length by the aperture. The smaller the f/number, the lower the magnification, the wider the field, and the brighter the image with any given eyepiece or camera.

Fast f/4 to f/5 focal ratios are generally best for lower power wide field observing and deep space photography. Slow f/11 to f/15 focal ratios are usually better suited to higher power lunar, planetary, and binary star observing and high power photography. Medium f/6 to f/10 focal ratios work well with either.

An f/5 system can photograph a nebula or other faint extended deep space object in one-fourth the time of an f/10 system, but the image will be only one-half as large. Point sources, such as stars, are recorded based on the aperture, however, rather than the focal ratio – so that the larger the aperture, the fainter the star you can see or photograph, no matter what the focal ratio.

f/8
Aperture:
This is the diameter of the light-gathering main mirror or objective lens of a telescope. In general, the larger the aperture, the better the resolution and the fainter the objects you can see.
20"
Telescope Type:
The optical design of a telescope.  Telescope type is classified by three primary optical designs (refractor, reflector, or catadioptric), by sub-designs of these types, or by the task they perform.
Ritchey-Chrétien
 
Based on Astronomy magazine’s telescope "report cards", scopes of this size and type generally perform as follows . . .
Warranty:
2 years
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20" f/8 truss tube Ritchey-Chrétien optical tube

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20" f/8 truss tube Ritchey-Chrétien optical tube
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Our Product #: AT20RCT
Manufacturer Product #: AT20RCT
Price: $12,995.00  Ground shipping: $495.00 - Click for more info
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The Astro-Tech 20" f/8 AT20RCT carbon fiber Serrurier truss Ritchey-Chrétien makes high quality large-aperture/large format DSLR and CCD imaging affordable for the dedicated amateur astrophotographer and educational institution.





. . . our 35th year