I've recently noticed an oddity with using screwmount lenses in Av on the K100D. Underexposure.
I've been testing it today, and I'm seeing 1-2 stops of underexposure, but only with screwmount lenses. I get a good exposure with K/M lenses wide open (only way they're usable) and good exposure in M mode. For example, I'm getting 1/160th at f2.8 in manual with the 105/2.8 ST, pointed at an evenly lit white sheet of paper in M mode, centre-weighted metering. I'm getting 1/400th in Av, all settings being equal (I'm literally twidlling the mode dial to compare). The D didn't do this, and I'm getting identical exposures with my M 50/2 and Kiron K 28/2, as well as good exposures with the DA 16-45 and A 70-210. This is weird. And sad, I prefer just running in Av mode to pure manual. -Adam -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
