What is the aperture? The bigger the better? What does F mean?

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.

F value is the amount of light entering. The larger the aperture, the more light per unit time and the faster the shutter.

The function of the aperture is to determine the amount of light entering the lens. When the shutter is constant:

The smaller the value behind (1)F, the larger the aperture, the more light entering, the brighter the picture, the narrower the focal plane and the more blurred the background of the subject.

(2) The greater the value behind f, the smaller the aperture, the less light entering, the darker the picture, the wider the focal plane, and the clearer the front and back of the subject.

Calculation formula: F value of aperture = lens focal length/lens aperture diameter.

The gear design of the aperture is that the numerical difference between two adjacent gears is 1.4 times (the square root of 2 is the approximate value of 1.4 14), the diameter of the light-transmitting hole is twice the root number, the area of the light-transmitting hole is twice different, the brightness of imaging on the negative is twice different, and the time required to keep the same exposure is twice different.