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I have a Bintel 8"F4. FOV 1.5x1deg on an APS sized chip.
Collimation is your biggest issue. You will need to buy Jim Fly's collimation tools, a laser is not going to cut it. F4 is very fast and collimation has to be spot on because of it.
Also worthwhile to get it flocked. I am in the city and went from 90s to 150s exposures, before light pollution got the better of me after flocking.
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