What's that square on the cover of an old-fashioned stupid camera?

The hood is a common photographic accessory that covers the camera lens. It is made of metal, hard plastic, soft rubber and other materials. Its functions are as follows:

1. When shooting with backlight, side light or flash, it can prevent non-imaging light from entering and avoid fogging.

2. When taking photos with forward light and side light, the scattered light around can be avoided from entering the lens.

3. In lighting photography or night photography, you can avoid the surrounding interference light from entering the lens.

4. It can prevent the lens from accidental damage, prevent fingers from touching the lens surface by mistake, and shield the lens from wind, sand, rain and snow to a certain extent.

Backlight photography widely uses a hood, which can generally avoid glare. However, if the light source is close, glare may still appear. At this time, you can cover the range hood with your hand on the side where the light source is located. Whether the glare is eliminated or not should be observed clearly from the viewfinder. Generally speaking, a lens comes standard with a hood, but different lenses are equipped with different hoods, so many products cannot be used interchangeably.