I am glad I tend to use lenses wide open and near that :-) Could it be that the meter does not get enough light for an accurate measurement when stopped down?
Regards, Lucas On 4/4/09, Godfrey DiGiorgi <[email protected]> wrote: > I found the same thing ... The green button metering is accurate wide > open and near that, but accuracy becomes increasingly off as the lens > stops down. > > Several possible causes come to mind, but the unfortunate truth is > that I never found a way to solve it that didn't have less desireable > side effects. > > Godfrey > > On Apr 4, 2009, at 11:33 AM, Bob Sullivan wrote: > >> Bill and Godfrey, >> I've found that I don't really understand the 'green button' >> mechanism. >> I can operate the green button fix just fine, but exposures are a bit >> of a mystery. >> See here, where I used an old M35 f2.0 lens on manual. >> http://picasaweb.google.com/rf.sullivan/K352ApertureTestOnK20d# >> Exposure seems to go off as you get to smaller f stops. >> Now if the green button causes it to stop down and meter, >> how can it be off? You just metered the shot at f12.8, or whatever. >> The mechanism for this error is a mystery to me. >> Regards, Bob S. > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. > -- -- Regards, Lucas -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
