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Employing both reflecting and refractive optical systems.
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Single- or dual-fork mounts are standard on catadioptric scopes.
The primary difference between reflectors, refractors, and catadioptric telescopes is revealed in the path that light travels through each scope.
This basic design has been enhanced by its catadioptric descendants.
While the performance of a catadioptric rarely exceeds that of a Newtonian with a similar-size objective, its convenience lies in optically "folding" a much longer instrument into a small package--important if storage or transportation space is at a premium.
But for catadioptric scopes based on a Cassegrain design, the tube is considerably shorter than the focal length, owing to the internal "folding" of the light path.
A fork mount on a wedge is common for catadioptric instruments--the scope's tube rests between two support arms (but some scopes are held by a single arm).
Then there's the third category of telescopes, the catadioptric or compound telescope.
In terms of cost, aperture for aperture, the catadioptric lies midway between the reflector and the refractor.
These are refractors, reflectors, and catadioptric instruments on mounts that are controlled either by a plug-in hand-held computer or remotely by an external PC.
This 1,300-mm-focal-length (f/12.5) Maksutov-Cassegrain reflector features a 4-inch (102-mm) catadioptric tube assembly.
The Astele catadioptric is a 3.7-inch (95-mm) Maksutov-Cassegrain optical system of 1,200-mm focal length (f/12.5).
Currently Orion's largest-aperture Maksutov-Cassegrain scope, this reflector features a 5-inch (127-mm), 1,540-mm-focal-length (f/12) catadioptric tube assembly and includes a 1.25-inch, 25-mm (62x) eyepiece, a 90[degrees] mirror star diagonal, and a 6 x 26 erect-image finder.