So I just bought my self a Nikon F3 bundled with an MD-4 and 50mm/1.4 lens. Everything is working perfectly, but I do have a question regarding the usage of the MD-4 and I have encountered a very minor problem with it. Is it healthy for the camera to leave the motor drive on? Would I be right to assume that the drive leaves the shutter cocked, which isn't any good for the internals in the F3? The problem I am having with the drive is that it seems the battery check button does not work. The right LED seems to come on when the shutter actuates, though. As well as when the film counter hits 0. If anyone else has had this problem, could you enlighten me on any fixes? While it does not hinder the performance of the drive, I would ideally would like to have a fully functional machine. Thanks!