Just acquired a mint F100 from an estate. Ran a test roll, everything's fine. The only problem is that it eats batteries! I'll put a set of new alkalines in, dry fire a couple of shots, and the battery is completely dead. Switched batteries, tried some rechargeable ni cads--same problem. Any one else experienced this with this camera? BTW, in all my years of shooting 35mm, this is my first Nikon. Any suggestions out there?