I'm new to this group. I'm also new to Medium Format as I recently purchased a Yashica Mat 124G and I'm trying to use my Nikon SB800 flash unit with it. From everything I've read using a simple PC cord should work fine, as long as the camera is set to X for flash mode, and the SB800 is set to anything other than TTL mode. I ordered and received a PC cord and tested it with no film in the camera, and it seemed to work fine, but once I got a bracket for it and tried to use it with film in the camera, the flash would intermittently not fire. I've tried lots of different settings on both the camera and the flash and the problem persists. Once I take the film out and test it again, the flash fires every time. Any insight on the cause would be greatly appreciated!