As far as I can remember there was no other sync setting apart from 'X' in other words Electronic for the Petri 7 camera.
I have just checked the on line camera instruction website and the Petri 7 and 7s do have synch for M as well as X but there is no switch to change them over. What this will probably mean is X will synch at all speeds with no loss of light reaching the film but M (bulbs) will synch up to 1/30th at full power output but above that there will be a loss of light reaching the film.
Last edited by BMbikerider; 08-13-2013 at 06:40 PM. Click to view previous post history.