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I personally wouldn't use either of the achromats. Assuming that it has enough back focus, the 8" Newt would be my choice every time, much shorter subs, no CA, and better resolution, no contest. You would just need a coma corrector, if you don't already have one, and you are off and running. It also just occurred to me that the 152mm is photographically slow at almost f/8, and the 102mm is painfully slow at almost f/10, meaning much longer subs than either the 8" Newt or an APO.
raymo
Last edited by raymo; 18-02-2022 at 03:16 PM.
Reason: more text
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