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I have a 10" sct but for astrophotography use an 8" SCT usually with an f6.3 focal reducer. If you want to do astrophotography an 8" will give an easier learning curve, better photos and less hassle than the 12". Learn on the 8" and then if you still want to go the 12" but most people never exhaust the capabilities of a well collimated and guided 8" SCT.
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