> Well, Frank, some K-mount lenses allow one to unscrew and
> remove the entire front element group and get directly to the
> diaphragm. You might try that ... but be careful, I don't
> know which lenses allow that and which don't, and since you've
> not told us which lens you're working on, I can offer little
> more at this point other than to say I've done this on several
> manual focus K-mount lenses.
It's a Pentax SMC K 28mm f/3.5
Frank
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