Hi Ray,
just want to say that an f4 system is not ideal for doing galaxy imaging. It is just too short in focal length. Personally I would forget that and look more at a system around f8. Probably an RC or a CDK is going to serve your purposes best. Use a camera with large wells sensors like the 11000 will give you great stars and allow nice deep imaging.
Anyway just my opinion and good luck with your selection.
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