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Author Message   Chris_sherlock Tinkerer Username: Chris_sherlock Post Number: 9 Registered: 08-2006 Rating: N/A Votes: 0 Posted on Tuesday, November 25, 2008 - 08:30 pm:    G'day Martin, Now I could be wrong, but I seem to recall you should not use stop-down on the Spotmatic F with an SMC lens, only open aperture. Stop-down was for Super Takumar and similar which lack the coupling for full aperture metering, at least that's what the manual says. You would get an incorrect reading trying to use stop-down with an SMC lens. Regards, Chris