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Hi - I am in the process of setting up a M250 as an imaging scope. If you want a visual scope then leave it at f12. If you want a planetary imaging scope again leave it at f12. If you want to use it for DSO's then you will need to get the corrector and the reducer - personally I wouldn't bother with the 1.5X extender. Without them the scope is far too slow - even at f10 you may still have to resort to binning your image to cut exposure times.
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