I've attached a couple of my OM lenses and it appears that it is not adjusting the shutter speed correctly. When aperture is wide open it looks fine, but when stopped down to f11 or f16 the image is much darker. It does this in Aperture priority, P or i-auto. I've been through the forum and the settings and can't find anything that might affect this. Any help would be appreciated. Edit: I should have added it's an E-P1. The images are underexposed..