I just purchased a Nikon D3100 kit from Suningyi. When I press the shooting button, the screen is black. After taking the photo, the photo will be displayed again. What is the reason?

You are used to the screen viewfinding of small digital cameras. The standard viewfinder method of SLR is to use the eyepiece to view the view without relying on the LCD screen. Because the LCD screen consumes more power, the LCD screen does not light up before shooting. Yes, you need to check the shooting effect after shooting, so the LCD screen will light up for a few seconds. Monocular viewing is conducive to holding the camera stably, that is, holding both arms in front of the chest, holding the zoom ring of the lens with the left hand, holding the handle with the right hand, and the body of the camera is close to the face, forming a stable three-point support, even if you are shooting with a telephoto lens. Easy to flake.

When using the LCD screen to view the scene, the screen should be 15-20 cm away from the eyes (this is the distance for clear vision of the human eye), and the arms can only be suspended in the air. SLRs and their lenses are heavier, unlike small digital cameras. So light, the stability of shooting cannot be guaranteed.