Mirror lock-up (MLU) is a feature employed in many Single Lens Reflex (SLR) and DSLR cameras. It allows the operator to reduce vibration-induced motion blur during exposure.
Normal operation in a camera involves flipping the mirror up out of the light-path just before the shutter opens, and then returning it when the shutter closes. This causes vibration of the camera, particularly when the mirror slaps into the top of the mirror box. This vibration quickly dies away so the most motion blur is actually seen with short shutter times that capture multiple ‘swings’ of the vibration (shutter speeds of 1/2 to 1/60 second are often affected by this). While longer exposures will capture all of the vibrations, the exposure will be dominated by light captured when the camera is vibration-free. Mirror lock-up involves flipping the mirror up well before the shutter opens, allowing the vibrations to die down before exposing the film. On some cameras MLU may be operated by an extra push of the shutter button, the second push resulting in the actual opening of the shutter. Other arrangements may involve an extra lever or button that flips the mirror up before using the shutter release button normally. On some cameras MLU is not a separate feature, but operated as part of the self timer.
Note that when the mirror is in the up and locked position, the subject is no longer visible through the viewfinder. Therefore, the photographer must compose the photograph prior to activating mirror lock-up and keep the camera from moving. Use of a tripod helps prevent movement of the camera during this operation. Combined with a remote or cable release, this greatly reduces the potential for vibration of the camera.
With mirror lock-up the mirror (2) flips up towards (5) well before the shutter (3) opens. As a result light no longer reaches the eyepiece (8).