I think I understand what you're asking. I have a PST which is quite small compared to your Ed72 setup and I can see surface detail in Ha, albeit, not to the extent seen through a cam as the disk is quite small with the eyepieces I have.
I do have one question which may be related. Does it really matter so much if I image solar Ha from an inner city location compared to a more rural setting? Will this have an effect on disk surface detail visibility?
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