Hi all,
I just purchased a Pentax k-1 with a PENTAX-D FA 28-105mm f/3.5-5.6 ED DC WR Lens. I'm noticing a really even fine grain visible through the viewfinder across the frame and it is not autofocusing correctly. I've tried another lens and don't have this problem with it so it seems to be the lens. The strange thing is the grain doesn't seem to show up on the photos.
any ideas? defective lens? or defective user?