William Robb wrote on Fri, 09 May 2008 19:35:34 -0700 > The istD was, apparently, the only camera that would green button > manual correct exposure with > manual aperture lenses. All subsequent models have exposure wonks. > Or so I have read.
Bill, my experience has been the pretty much the same. On my K10D and K20D bodies, all of my MF lenses (including the A lenses when using the aperture ring) all show fairly accurate exposure from wide open down to about f4-f5.6, and then progressive overexposure (up to several stops) at smaller apertures. My *ist-D shows much more modest changes in Green Button metering accuracy using the same lenses. I've tried the screen switching gambit with no success, so I don't believe that different scattering properties of the newer screens is a significant factor. I suspect the the metering circuits simply don't cope well with the lower light levels at smaller apertures, as suggested by an earlier poster. My solution is to use the *ist-D with my older lenses whenever possible, otherwise to use trial and error manual exposure. It's not that difficult to make a trial exposure, look at the histogram, and adjust as needed. Regards, Jim -- 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.
