The P67 has a focal plane curtain shutter. It's big enough that its mass vibrates the tripod mounted camera enough to register a visible double image on an exposure of multiple (I don't remember exactly, but a bracketed series of up to 45" I think) seconds. I photographed the 59th Street bridge and some roof top views of 57th Street a few years ago at night, and that's what happened. The prints from that session are nice, but I can't go beyond 11x14 nominal without seeing the doubled point source lights on the bridge. I don't believe a leaf shutter would have allowed that.
Originally Posted by John Koehrer