This particular phrase describes an obsolete feature on old cameras that is no longer available on new Pentax cameras. Just mentioning the feature caused SHOUTING and endless RANTING by a particular subscriber (JCO). Since placing him in my kill file, I no longer see his messages and it doesn't bother me. The poor soul needs medication... Regards, Bob S.
On Fri, Sep 11, 2009 at 1:55 PM, Charles Robinson <[email protected]> wrote: > On Sep 11, 2009, at 13:38, Desjardins, Steve wrote: > >> It was, essentially, a little doohickey inside the body end of the lens >> mount that pressed a tiny pin on the older lenses that would make the lens >> stop down to chosen f stop. It went away when Pentax ate from the tree of >> digital knowledge, but many still await its return. >> > > bzzt! > > It was a lever on the body which would interact with a lever on the lens > (K-M series automatic lenses) so that the camera body would know: "hey, this > lens is now stopped down to such-and-such a stop" while allowing the > aperture to remain all the way open. The light meter would compensate as if > there was less light coming in so that you'd know the exposure was set > correctly. > > When the photo is/was taken, the other thingie which has been holding the > aperture all the way open would drop and the lens would stop down to the set > value - shutter opens, shutter closes, aperture again pops all the way open. > > This ability (to "just know" what aperture the K or M lens is set to) is not > in the digital SLR bodies. If you have a "non-A" lens, and you want to > shoot at something other than wide open, you have to use manual mode and > "the green button" to physically stop down the lens, take a light reading > WITH THE APERTURE STOPPED DOWN, and then pop the aperture wide open to let > you focus, compose, etc. > > I may have some specifics wrong, but that is *basically* it. > > -Charles > > -- > Charles Robinson - [email protected] > Minneapolis, MN > http://charles.robinsontwins.org > http://www.facebook.com/charles.robinson > > > -- > 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. > -- 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.
