Shutter

Curtains


The shutter on a SLR and a DSLR usually works like the animation above.


 * 1) The first curtains opens and exposes the film / digital sensor.
 * 2) Then the second rear curtains start closing.

The time the sensor is fully open is called sync speed. it's the fastest shutter you can use with a standard studio strobe or a simple flash.

Leaf shutter
Some medium format cameras (like Hasselblad and PhaseOne) uses a leaf shutter that works much as the aperture. This makes it possible to use much higher sync speed.

Electronical shutters
A CCD usually have a global shutter and a CMOS have a Rolling shutter

Rolling shutter
A rolling shutter reads from the top down, one row at the time. This causes some problem with fast moving objects AKA jello