I have a ILEX ACUTON 7 1/2" (190mm) f:4.8 lens in a Copal 1. It seems to have some deterioriation of the coatings on both surfaces nearest the shutter. On the rear element the deterioriatin seems to cover about 50% of the element but I am not sure which is good/bad part. I have gotten both clear and splotchy images from the lens depending on lighting.
Keep the shutter and toss the lens? Try to remove the rest of the coating on the really bad element?
I have 135mm and 210mm lenses I like so the 190 isn't critical but it is easy to focus at F4.8
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