Yesterday I picked up a roll of 120 Portra 400 which I shot with a Bronica ETRS and a 50/2.8 MC. The AEII finder and Speed Grip were attached. The first eight frames, shot in October are perfect. The ninth frame, also shot in October, shows obvious camera shake even though a slow shutter speed was not used. The last six frames were shot in December, all indoors and without using the AE-II's meter, hand-held at 1/60. The first five were at f/4 and the last at f/5.6. The tenth frame is fine. The 11th frame shows shake. The twelfth frame is mostly good but shows what looks like a reflection at the top of what's in the rest of the frame. The thirteenth frame shows shake and the last two frames are fine. The last six frames were shot with a day in between each frame. The red light flashed on in the finder for each of the last six frames so I assumed that the battery was OK. About ten weeks ago I shot two rolls of Portra 400 with the same lens, mostly with a Minolta 360PX flash in non-TTL Auto mode. All of those frames were fine. Here are some of my theories: 1) Oily magnets in the lens, 2) A problem with the mirror return on the shot with the reflection, 3) A bad battery, 4) Dust or oil on the lens mount electrical contacts or on the electrical contacts of the camera. The spacing between the frames is not perfectly even but is acceptable and there are no overlaps. Any ideas?