After seeing threads about inaccurate exposure with non-A lenses, I hauled out my tripod, my K10D and my SMC-P M 100/4 Macro, and did some testing.
I found that in Av mode the exposure was virtually unpredictable, but I need to do some retesting to find out if it is a "one stop" mode. In M mode, I found that I could get consistent results only at f/5.6 through f/11, and to get an accurate reading on the exposure scale, I needed to stop down with the dof preview once, and then again. So my p...
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