I have a PM2 and have been using some Pentax PK and Olympus OM lenses with no issues. Recently I bought Konica Hexanons 135/3.5, 57/1.4, and 40/1.8 and am getting a weird over-exposed band at the bottom of the photos. It's inconsistent but for the most part it happens at F4.0 and below on any of the three lenses. F8, for example, is perfect. The pattern is also inconsistent even if aperture/shutter speed is constant. It looks like the shutter wasn't closing all the way. So I shot all day today at 3:2 to crop off the problem area. 4:3, however, the problem persisted. Since I was thinking it's the shutter and not the lenses, I came home thinking I'd change the lens and try it but now that I'm home and am still using the Konica lenses, regardless of what shutter speed/ISO/aperture I use I can't replicate the problem. I mean, was my shutter temporarily not closing fully while using higher shutter speeds and now fixed itself? Weird. Anyone seen this before? How do I remedy it?