It is an Nikkormat EL that I just got from ebay. There are couple of things that make me puzzled. 1) where to install the battery? 2) when I flip the mirror up manually using my fingers and release my fingers, the mirror doesn't bounce back like my Nikon FE2 and Minolta XD5 and SRT202. Is this normal? Does the EL use some electronic way to flip the mirror up and down? 3) I can't press the shutter release down. But I can press the shutter release buttons on the FE2, XD5 and the SRT202 even if there is no battery. The seller said the camera is in working condition. So I am not sure if there is something that I didn't do right. Any information is appreciated!!