Why does a black sweater glow white when shot with a SLR?

This situation is caused by overexposure.

There is a jargon in photography: "Add white to black and subtract".

When shooting black objects with a SLR Or when the subject is small and the black background is heavy,

automatic exposure will transition.

The opposite is true for white.

That’s why: “Add white to black and subtract”, this sentence,

Press the menu to reduce, you can adjust the exposure, the specific operation can be found in the manual,

Reduce the exposure by 2 to 3 small steps. The specific number of 2 or 3 depends on the effect of the film.

In addition, there is no such operation when shooting in automatic mode. In manual mode, you need to look at the lower part of the viewfinder. In AV mode or TV mode, you need to click on the menu and operate on the big screen.

For your shooting situation, it is recommended to use AV mode and shoot with a small aperture.