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Employing both reflecting and refractive optical systems.
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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.
5) Maksutov-Cassegrain reflector features a 4-inch (102-mm) catadioptric tube assembly.
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.
Its 5-inch (127-mm), 1,540-mm-focal-length (f/12) catadioptric tube assembly has a 90[degrees] mirror star diagonal, a 6 x 30 finder, and a pair of 1.
25" / 2" Mount type Dobsonian Dobsonian Weight 36 lb 35 lb Motor drive no no Computerized "Go To" no no Supplied eyepieces 9 mm (133x) 10 mm (120x) 25 mm (48x) 25 mm (48x) Manufacturer Konus Orion Telescopes Model MotorMax-90 AstroView 90 EQ Price (US$) $249 $249 Optics type catadioptric refractor (Maksutov-Cassegrain) (achromat) Aperture 90 mm 90 mm Focal length 1,200 mm 910 mm Focal ratio f/13.