Well, my last roll in the F6 had some way overexposed shots. First off I thought 'oh noes, camera broken', then I remembered I had used the Nikon 35 f2 AFD lens. A lens which is excellent optically but notorious for sticking aperture blades due to oiling. Sticking blades = sluggish aperture closure = over exposure.
This had happened once before with this lens and I had it repaired for about $100. That was maybe four + years ago now. And checking it this morning - yep it's happened again.
Le sigh. Not really in the mood to fix it again, will just use the stoopidly big Sigma 35 Art 1.4 if I need a 35 AF lens on the camera.