Tony,
Great effort with that small refractor
Well done !!
I agree with Raymo , Galaxy imaging is more suited to the bigger scopes with more light gathering power and resolution ( 8” and above )
Even an 8” f5 Bintel newt ($549 ) on that AZEQ6 with your 553 would yield great results.In saying that the longer focal length (1000mm) and aperture would require guiding at a image scale of 0.78 arc sec per pixel to take advantage of resolution with longer subs.You can take 60 sec unguided subs with an 8” but your PA has to be sub arc minute and your holding back the capabilities of that 533 camera.
Cheers
Martin
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