>>3414529The Pentax SLRs (like most) do through-the-lens metering, and so if you use a lens that is not made specifically for the camera, the camera meters through the aperture as you set it rather than by keeping it open and then stopping down because it can't compensate accurately (and also doesn't have the mechanisms anyway). On my Spotmatic F there is a stop down switch as pictured which I have to use for my other M42 lenses (like
>>3414553 says), can you find something similar on the Minolta? Or maybe the lens will do it?