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The F ratio wont stop you...the lower F ratio just means quicker imaging meaning less time exposure is needed....I cant see why you cant image with your Mak...Whats the focal length of the Mak....and what type and way do you want to image.
I am imaging at F10 at the moment with a Focal length of 2800mm
Putting a 2x barlow doubles your scope to F26
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