How to test the loss of focus of Sigma 50 1.4? Reward points

Actually, you have already tested it, and the results have come out. Horse 50 mm.

1.4 out of focus, this can be confirmed! That test software, if it is not matched by other professional auxiliary tools, the result is not as accurate as the actual shooting, so there is no need to download it.

The result of defocusing is that the subject in the image is not clear enough, or the image is not clear. Aside from the handshake, the second composition changes the shooting distance and keeps the focusing mode closed to the outside world. The reason is that the signals of the lens body are not well interconnected, such as the lens can't execute the instructions correctly, and the signals fed back by the lens to the body are wrong, that is, the lens and the body can't fit each other completely. The solution is to take more pictures and choose one that is out of focus. In addition, try not to make a second composition after focusing, so that the shooting distance will not change and some out-of-focus phenomena will be avoided. In addition, when shooting portraits, try to choose a darker background and use less backlight to shoot portraits, so that stray light will not enter the lens and will not interfere with focusing. Good friends, don't choose a big aperture.

In a word, out-of-focus phenomenon is very common in digital photography. Every company is out of focus, especially if the deputy director is used, the probability of out of focus will be greater. No one can explain this problem clearly at present, and there is no good solution. Just take as many photos as possible.

I hope my answer can help you and wish you success!