Most of the time when I shoot Miranda I shoot with unmetered or matched needle bodies. Recently I shot my EE bodies, which I usually shoot in manual exposure mode, yesterday I shot in shutter speed priority mode. The shots in which I overrode the auto exposure mode came out fine, the others on both bodies were underexposed. The Miranda EE takes one mercury PX 675, while a Konica T3 takes 2 PX 675. I have not had this issue with my Konica, T, T3, or T4. I use hearing aid Zink air batteries 1.4 V. My question is does a single hearing battery have enough amps as opposed to volts to drive the aperture cam that changes the F stop in auto exposure mode?