Help. I have noticed faint circles on my 4 x 5 film. Same spots, usually every t ime. At first, I thought it was only on b & w film but have noticed on some of m y trans. film, as well. Most noticable in solid dense areas of film --- seems to be usually in vertically composed images (?). I tried to check bellows for pin hole light leaks but didn't notice any. Lens appears perfect. Any ideas ?
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