Hi all,
Just some fun to share:
Recently got my hands on an older B&L petzval to play with, the question became how to whip up a lens board for the old Calumet Black Beast to test this out on. Got my ruler out and managed to 3d print a lens board specifically for the lens and the retaining ring.
Attachment 185540
All I had handy was red filament, so I had to prime and spray the boards backside black.
Attachment 185541
Seems to be light tight, will post some wet plate tests later!