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have a look at Shiraz(Ray)'s galaxy images here. all taken with an 8inch F4.
what dslr are you using?
Galaxies will require longer FL's but you can get good results with the F4's as well.
here are some early test raw subs of mine taken with a 10inch F4. single 3 min subs. ngc300 was a 7min sub.
uncropped with a kaf8300 sensor which is smaller than a dslr.
I was still adjusting collimation, focus, spacing and tilt so stars aren't round.
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