Subaperture CATs

With apologies to animal lovers, there is more than one way to skin a CAT (metaphorically speaking), and there is also more than one way to make one. Several variants on the standard MCT and SCT design have been appearing of late that attempt to capitalize on the strengths of the telescopes while avoiding the weight and expense of the 8-inch and larger MCTs' deep dish corrector plates or the fabrication difficulty inherent in the SCT's big lens. These telescopes do this, as the larger Orion MCTs do, by downsizing the corrector to a couple of inches and placing it in front of and often in contact with the secondary mirror or in the focuser assembly.

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