I've recently aquired 2 500 type cameras, the 500C and the 500 C/M. Both came with C T* lenses, and both appear to work correctly.. My question pertains to what looks like a flash sync plug on the 500 C that doesn't appear on the C/M. ???? Is it a flash sync and what speed on the lens would I use to sync with a Mets CT60 type flash? Thanks, 8) Jeff.