Interchangeable-lens cameras with a central shutter within the lens body require that each lens has a shutter built into it.
2.
Many medium-format and most large-format cameras, however, have interchangeable lenses each fitted with a central shutter.
3.
In practice most cameras with interchangeable lenses use a single focal plane shutter in the camera body for all lenses, while cameras with a fixed lens use a central shutter.
4.
Some had both a focal-plane shutter ( for lens interchangeability ) and a lens with central shutter ( for flash synchronisation ); one shutter would be locked open.
5.
Film cameras, but not digital cameras, with a central shutter and interchangeable lenses often have a secondary shutter or darkslide to cover the film and allow changing lens in mid-roll without fogging the film.
6.
One of the advantages of focal-plane shutters is that the shutter can be built into the body of a camera which accepts interchangeable lenses, eliminating the need for each lens to have a central shutter built into it.
7.
A " central shutter " is not a type of shutter as such, but describes the position of the shutter : it is typically a simple leaf shutter ), and located within the lens assembly where a relatively small opening allows light to cover the entire image.
8.
Lenses offered for the S2 include Summarit-S in normal ( 70 mm ), wideangle ( 35 mm ), and macro ( 120 mm ) varieties, and Tele-Elmar ( 180 mm ) portrait-length telephotos; these are available in versions that feature integrated multi-leaf blade shutters ( " Central Shutter ", or CS ), in addition to the focal-plane shutter in the camera body, to enable higher flash sync speeds.
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