Hey guys. Recently I was given a Hasselblad 500C/M, and I don't have a lens yet (or a back). I was testing the camera out by turning the crank and then pressing the shutter button to make sure the curtains and mirror moved correctly. Everything seems to be working, but why does this happen: sometimes, and I'm not sure if it's the way I press the button or what, it seems like I press the button, the mirror goes up, but the curtains wait like 5 seconds or something to pop open. Is this normal? Thanks to anyone that can shed any light!