What is better? Leaf shutters or Focal plane shutters. The answer is neither! Both have pro’s and con’s to their function and application.
First lets talk about focal plane shutters. Today most cameras use a two curtain focal plane shutter, in the past there were single, drum and rotary.
We will restrict ourselves to the two curtain focal plane shutter as it is the most widely used in modern cameras. The location of the shutter in the camera system is directly in front of and covering the focal plane, which is the face of the film or sensor. It is constructed of two curtains one in front of the other, and named, unsurprisingly, the front and rear curtains. As well as this there is a mechanism for opening and closing the curtains, which is primed, (curtains moved from rest position to ready position) and released ( initiation of exposure process and return to rest position) by pressing the shutter button.