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Hi,
focal length, number of sub-exposures (higher number of subs, higher s/n ratio), location would all make huge differences.
the F4 would gather more light than the F8, 30 sec sub on the F4 against 20sec on the F8, a lot depends on post processing as well.
I think you can use a focal reducer on the meade, not sure if that will reduce exposure time for similar results.
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