Originally posted by dosdan I've just got a K20D and its exposure is messed up with M lenses compared to their use on the K100D Super. M50/F1.7 & M28/F2.8 used in "M" mode . I'll probably stick to using them in the F4-F9.5 range and work out the EV comp for this.
I just did a quick and dirty test with my k20D and an M50/1.7, same gear as above.
I took a series of shots at 1 stop intervals from f1.7 up to f22.
The histogram only showed minor differences up to f11, at f16 and f22 it exposed at the same shutter speed as at f11.
I also tried the same with an A28/2.8, and stopped down using the diaphragm ring, results were fine up to f11, but underexposed a little at f16 amd f22.