"William Robb" <[EMAIL PROTECTED]> wrote: >From: "Peter J. Alling" > >> Now that's just silly if you think about it. > >No it isn't. I have read in some of the Pentax literature that some >of the camera meters doesn't recognize f/1.2. >I don't know which ones off hand.
"A" series and later cameras won't do matrix metering with 1.2 lenses because there's no lens mount "code" for that aperture. That's about the extent of the limitation. See Boz's page at http://www.bdimitrov.de/kmp/technology/K-mount/Kaf.html "The next question is then "how can the body distinguish between A-series and earlier lenses (even when the aperture is off the "A" setting)". Some Pentax literature points out that no matrix metering is possible with the A 50/1.2 lens. This lens is the only one whose mount contacts are all metal, i.e. its mount is identical to that of a K/M series lens. All other A lenses have at least one plastic contact. So the bodies must be looking for at least one non-conducting mount contact." -- Mark Roberts Photography and writing www.robertstech.com
