On Sun, Apr 5, 2009 at 6:43 AM, Toralf Lund <[email protected]> wrote: > Godfrey DiGiorgi wrote: >> >> The issue could [ ... ] >> >> Lenses like the FA77/1.8 work fine in manual metering mode when used >> normally (lens locked on the A setting, aperture set by the body controls) >> but show the same metering issues as K and M series lenses when the aperture >> ring is used to set the lens opening and the green button stop down metering >> is used. > > Do you have to do that with FA lenses? I've always been under the impression > that they would transfer the actual aperture value electronically when the > ring was used, which should mean you could always do full aperture metering > even without the mechanical coupling... > > - Toralf
FA lenses only communicate max and minimum aperture, on the film bodies which allow use of the aperture ring on A lenses, working aperture is computed based on the position of the mechanical coupling and the communicated max aperture. The aperture ring is not electronically coupled. The DSLR's don't use any of the electronic information when the aperture ring is not at A. -- M. Adam Maas http://www.mawz.ca Explorations of the City Around Us. -- 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.
