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I currently have the components to attach 3 DSLR to a mount at once. Overall cost of that was about $500 (bought the stuff a while back) but it is purely for DSLRs.
If you want to do really deep stacks, you cannot do it with a standard DSLR. You need to be able to precisely match temperatures with your images and darks otherwise the mismatch in thermal noise because your limiting stack depth.
Your flats should have 100+ and be 50% of saturation. Each camera will need its own set of Darks, Flat Darks and Flats. The more of everything the better! Remember, image calibration actually ADDS noise to your images but stacking allows you to average the left over random noise out.
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