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Hi Ryan. I'll add my 2c worth. The 4se is not really a good photo rig at f13 and only 4" aperture. It will take a lot of skill to coax an image of anything faint. I think your focus is fine considering the scope. I think your best targets for that scope are open star clusters, moon and planets. It will struggle with galaxies, globulars and nebula. Good targets are the jewel box, m6, m7, ngc3532, the pearl cluster, I forget the designation. Sprinter cluster. Etc.
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