Traditional Culture Encyclopedia - Photography and portraiture - What do the photography terms "defocus" and "half-press the shutter" mean?

What do the photography terms "defocus" and "half-press the shutter" mean?

Defocus is the blurred part of the photo, and it has the greatest relationship with the aperture shape of the lens. The rounder the aperture, the better the defocus.

Half-pressing the shutter button means pressing the shutter button halfway, which allows the camera to focus automatically.

The shutter button of a digital camera has two levels. When pressed halfway, only two wires are connected and the camera focuses. When pressed all the way, all three wires are connected, the shutter moves, and the photo is taken.

Generally, when shooting, press the shutter halfway first to allow the camera to focus accurately, and then press it fully to take a picture, so as to ensure that the photo is clear. If you directly press the shutter button fully, the camera's focusing mechanism will not have time to move, and the focus may not be accurate, and the resulting photo will be blurry.