Originally Posted by
engl
Thank you for your replies.
A lens with more coverage (and thus better wide open coverage) might help, but there are pretty much no such ~75mm lenses except the very expensive XL lenses. I will try stopping down to F8 and see if the more even (but lower) brightness helps.
I think I'm going to try ordering a new ground glass from Steve Hopf, he seems well regarded here. I'm not yet sure if I want a fresnel, I'm worried about loosing ability to focus well, and it seems I'd need to find a specific wide-angle fresnel.
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