What does the lens aperture parameter of digital camera mean?

Aperture values F2.8, F8 and F 16 are the aperture coefficients.

Aperture is a device used to control the amount of light entering the photosensitive surface of the fuselage through the lens, usually in the lens.

We use the f value to represent the aperture size. Aperture f value = lens focal length/lens aperture diameter According to the above formula, to achieve the same aperture f value, the aperture of a long focal length lens is larger than that of a short focal length lens.

When the physical aperture of the aperture is constant, the farther the lens center is from the photosensitive device, the smaller the F number is. On the contrary, the closer the lens center is to the photosensitive device, the higher the light density reaching the photosensitive device through the aperture and the larger the F number.

A camera is a kind of equipment that uses the principle of optical imaging to form an image and records the image with a negative. This is an optical instrument used for photography. In modern social life, there are many devices that can record images, all of which have the characteristics of cameras, such as medical imaging equipment and astronomical observation equipment.