The "Bessie" features the same Synchro-Compur leaf shutter that has been in every lens of the Hasselblad medium-format 500 Series for decades as well as in many other high-dollar cameras. Its shutter speeds range from 1 sec. to 1/500 sec. with the "B" setting for time exposures and were synchronized for electronic flash at all speeds unlike the focal-plane shutter where the shutter speed cannot exceed 1/125 sec. on most SLR film cameras with the exception of a high-dollar few. The lens I had was a Voigtländer 50mm f2 whose optics were made by Carl Zeiss and its aperature setter ringed around the lens. The shutter speed setter ringed around the hole in front where the lens was mounted and both, along with the selenium exposure meter needle could be seen while looking through the eyepiece so that you could do sequence shots of all kinds plus set your shutter speed and aperature without ever having to take your preferred viewing eye away from the "Bessie's" eyepiece.-Information provided by Stephen Potter.