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Coma in fast systems
I agree with Don Pensack....
In my experience as an amateur the coma is related to the fast cone of the f ratio. "faster" systems ie f 4 produce more coma than "slow" systems independent of the focal length. I agree you need to consider the FL for the overall sizing of the optics but coma is f ratio. My understanding is that the Hale 200" at f3.3 was coma limited hence the use of the Wright etc correctors.
My 2c.
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