I just purchased a Marvel 5x8 dry plate camera. The Scovill barrel lens has rotating plate with holes marked 15,20,25 etc. Looking at the holes, they sure dont look the same size as lets say f22. Can anyone gimme light as to how they are to be used? Are they roughly the same as a "normal" fstop? I am going to try film with this camera and really would like to understand how the old barrel lenses worked.
Any info would be appreciated before I start wasting film.
Thanks,
Chad
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