>On Thu, Nov 4, 2010 at 3:10 PM, Charles Robinson <charl...@visi.com> wrote: > On Nov 4, 2010, at 14:03, Subash wrote: > >> hi, >> >> anybody have experience with this lens? pretty heavy, a little over >> 1.5kg, but i saw one today for sale, it's in almost mint condition and >> so badly needs a caring home :) the one i saw today is the one on this >> page: >> >> http://www.pentaxforums.com/lensreviews/Takumar-300mm-F4-1962.html >> >> i guess what i really want to know is that once mounted with an m42 >> adapter, does one use this like a K/M lens with stop-down >> metering/green button? would appreciate any input you may have... >> > > It will be different. The aperture does not get held open, so if you're > dialing the lens down to f/11 you'll be looking through a lens which is > actually stopped down to f/11. > > On the bright (ha!) side, metering in Av mode would be real-time with no need > for the green button.
Charles, forgive me for asking, but do you actually use m42 lenses on a recent pentax dslr? I ask because I think it is a little misleading to say that metering in Av mode is "automatic". Let me immediately state that I'm a nOOb at both dslrs and m42s. But my experience is that when working with pentax dslrs and m42 lenses: - Av mode will work correctly ONLY if your aperture is wide open. if you want to stop down the lens, then the metering gets helplessly inaccurate. - Manual mode: the meter works reliably but requires one extra push of your metering or green button. (focus, set your aperture on the lens such that the blades actually visibly stop down, press the green button, fire away). I'm not trying to be a jerk but trying to get a better understanding for myself as well as others. Everyone feel free to enlighten me! Thanks, --------------------------- Sam -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
