What does infinite aperture mean?

The aperture range in each gear can not be subdivided, that is, stepless aperture.

Aperture is a device used to control the amount of light entering the photosensitive surface of the fuselage through the lens. Usually in the camera. In order to express the pore size, we use F/ value.

For the manufactured lens, we can't change the diameter of the lens at will, but we can control the luminous flux of the lens by adding a polygon or circular aperture grating with variable area inside the lens. This device is called an aperture.

Extended data

The function of aperture

1. It can adjust the amount of light entering the lens. For example, the pupil of a domestic kitten always shrinks into a line during the day, and automatically Zhang Kaicheng a round hole at night. So in the same way, when taking pictures, the aperture should be narrowed when the light is strong, and the aperture should be opened when the light is dark. That is to say, the smaller the F value (other parameters remain unchanged), the more favorable it is for shooting at night.

The adjusting ring on the rotating lens or the knob on the digital camera body is used to adjust the aperture size.

2. Aperture is the most important factor to determine the depth of field. Small aperture (large aperture value), depth of field, large aperture (small aperture value), depth of field! For example, nearsighted friends, if they don't wear glasses, always habitually squint at things, so they can often see things clearly. Applying photographic terminology, this is called: narrowing the aperture (pupil) and increasing the depth of field.

Baidu encyclopedia-aperture