A diaphragm shutter is a type of camera shutter located within or just behind the lens that operates similarly to an iris diaphragm. It consists of overlapping blades that open and close to control both the duration of exposure and the amount of light reaching the film or sensor.
This type of shutter allows precise control over exposure times and can achieve very fast shutter speeds, making it useful in both studio and field photography. Because the diaphragm shutter works in tandem with the lens aperture, it also influences depth of field and image sharpness. Photographers value diaphragm shutters for their accuracy, compact design, and ability to synchronise with flash.