What is the pre-elevation of my Canon 60d reflector? And when will this function be used? Beginner's advice

The mirror here refers to the mirror panel that emits the light entering the lens into the pentaprism in front of the photosensitive element in the fuselage, and then reflects it to the human eyes. When the shutter is pressed, the reflector is lifted, and the light entering the lens irradiates the photosensitive element to complete imaging.

When it comes to pre-lifting of reflector, it should be said that it is mainly used for landscape photography.

As we all know, a tripod is needed to shoot scenery films. Why use a tripod? Because the hand is unstable, in order to achieve good shooting effect, it is necessary to reduce the vibration of the camera, so a tripod is used. In order to further reduce the vibration, we should also cooperate with the cable release to remove the vibration generated by the camera at the moment when the shutter is pressed.

Next, in order to achieve a perfect shooting effect, even at the moment when the shutter is pressed, the camera vibration caused by the lifting of the mirror should be included, so the pre-lifting function of the mirror is needed at this time.

To sum up, this function is used for professional landscape photography and not used at other times. If the requirements for the work are not so high, it is generally not necessary.

When shooting a chorus in the audience, the performer's mouth is always moving, and the pre-elevation of the reflector is useless for shooting this theme.