Originally posted by res3567 My green button seems to overexpose images when use manual focus lenses with no AE contacts. It is especially bad on bright sunny days. Since the exposure compensation does not work in this capacity I have to do it manually. Any one else have this problem?
I assume that yours is a K10D or a K20D. This is a known issue. IME, the exposure is generally correct at large apertures (say, faster than f/2.8). The smaller the aperture, the more pronounced the overexposure.
So you need to know the character of each manual lens and adjust exposure accordingly. Until then, meter at max aperture of the lens, then keep doubling the shutter speed and halving the aperture until the desired settings.
A more permanent fix is to replace the current focusing screen with an LL-60 or LI-60 focusing screen (designed for the *ist series). Unfortunately, they are becoming rare these days.
I have 2 K10D bodies; one has the LL-60 screen.