As a new Hassy user (500cm) I am a little confused about how to use the flash sync. Coming from a typical 35mm where shuter speed is set to 1/60 and f-stop is determined by flash settings, I am confused about how to set the shutter on the Hassy. Take for instance an f-stop of 5.6. How do I determine the proper shutter speed? Any help would make this a great day.