Hi. I have a Zenza Bronica ETR, and a Fujica GW690. Both have PC sync ports, and the Bronica also has a hotshoe if I use the grip. I do, however, have a problem with both of these, which I can't seem to figure out why occurs. It appears as though either of the cameras will only trigger a flash every second exposure. If it is on a "right" exposure, and fires, I need to wind the shutter and advance the film, take another picture, and then wind the shutter again, and advance the film, before I can take another flash-triggering exposure... Any clue why this happens? Thanks.