Leaf shutters have an important advantage over focal-plane shutters. Leaf shutters can be used with electronic flash at all shutter speeds. This is not true with focal-plane shutters.
Focal-plane shutter. This is a pair of curtains (cloth in old cameras, overlapping metal plates in new ones) very close to the sensor that slides across with a gap of adjustable width between both curtains.
Focal-Plane Shutter An opaque curtain containing a slit that moves directly across in front of the film in a camera and allows image-forming light to strike the film.
Focal-plane shutter. A camera mechanism that admits light to expose film by opening a slit just in front of the film (focal) plane.
Focal-plane shutters are usually implemented as a pair of cloth, metal, or plastic curtains which shield the film from light.
The mechanical focal-plane shutter of film 35mm SLR cameras and Leicas are two curtains of metal or cloth that zip across the front of the film. At slow speeds like a full second they zip fast enough to appear to open and close immediately.
Most SLRs have focal-plane shutters. After all, if you're going to buy 10 lenses and one body, it makes more sense to put an expensive shutter only in the body.
Exposure time with a focal-plane shutter is measured from the instant the first curtain is released, to begin its travel across the frame, until the instant the second curtain is released, to begin its travel across the frame.
Designed for use with focal-plane shutters these bulbs make a nearly uniform amount of light for a relatively long time.
In most focal-plane shutters, the curtains travel at the same speed regardless of the speed setting: the shutter speed, the amount of time the film is exposed, ...
The traditional-style control layout will certainly appeal very strongly to some, the near-silent leaf-shutter can be a distinct advantage over the louder focal-plane shutters in the Micro Four Thirds cameras for some uses, ...
Focal-Plane Shutter: The shutter system on cameras with a built-in lens. When the shutter is pressed an opaque curtain containing a slit moves directly across in front of the camera film, exposing the film.
 See also: Focal, Plane, Shutter, Camera, Film
  
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