----- Original Message ----- From: "Jim King" Subject: Re: K20 and manual aperture lenses
> 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 > I'm thinking you are correct. I did a Q&D set of images of my neighbor's electrical drop. http://is.gd/eSC Other than some pixel dust, I'm not seeing any problems. The light levels were very bright (full sun). Poor Lowell over on the Dysfunctional Pentax Users Forum is sure annoyed though. I think his little world is really quite unhappy because his camera isn't perfect. This should end my foray into PP. Now back to real pictures. William Robb -- 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.
