What does the aperture of the lens do?

Photography refers to the process of recording images with some special equipment. Generally, we take photos with mechanical cameras or digital cameras. Sometimes photography is also called photography, that is, the process of exposing a photosensitive medium by using the light emitted or reflected by an object. The following is the function of lens aperture I collected for you, for reference only, welcome to read!

What does the aperture of the lens do?

(1) Adjust the lighting. This is the basic function of the aperture. When the aperture increases, the light intensity increases; When the aperture decreases, the light intensity decreases. It solves the exposure problem together with the shutter speed.

(2) Adjust and control the depth of field. This is the important role of aperture. Large aperture and small depth of field; Small aperture and large depth of field.

(3) affect the imaging quality. This is the function that the aperture is easily overlooked. Any lens has a certain aperture. The imaging quality is the best, that is, it is least affected by various aberrations. This aperture is commonly known as the best aperture. The exact position of the optimal aperture can be measured by using special instruments. Generally speaking, the best aperture is located at the position where the maximum aperture of the lens is reduced by about 2 ~ 3 steps. If it is greater than or smaller than the optimal aperture, lens aberrations such as spherical aberration, longitudinal chromatic aberration, coma, field curvature and astigmatism will increase, so try to use the optimal aperture when shooting to improve the imaging quality. The shape of the aperture will also affect the imaging quality. The closer the polygon is to the circle, the better the imaging quality. Generally speaking, the head of a dog is black: low-end mass lens, including the head of a low-end SLR camera.

What's the lens?

The lens has two fingers in film and television. One is the optical element used by film cameras and projectors to produce images, which consists of multiple lenses. Different lenses have different modeling characteristics, and their application in photographic modeling constitutes an optical expression means; The second finger refers to the picture taken continuously from power on to power off, or the fragment between two editing points, also called ytterbium head. One finger and two fingers are two completely different concepts. In order to distinguish, one refers to the optical lens and the other refers to the lens picture.

The lens referred to in film and television is not a physical or optical lens, but a lens that carries images and can form a picture.

The lens is the basic unit of the whole movie. Several shots make up a paragraph or scene, and several paragraphs or scenes make up a movie. Therefore, the lens is also the basic unit of visual language. It is the basis of narration and ideographic expression. In the early shooting of film and television works, the lens refers to the sum of an uninterrupted picture taken by the camera from the beginning to the stillness; In post-editing, a shot is a set of pictures between two editing points; In the finished film, a lens refers to a complete segment from the front optical transformation to the back optical transformation.

The main function of the lens is to collect the reflected light of the illuminated object and focus it on the CCD. The image projected on the CCD is inverted, and the camera circuit has the function of inversion. Its imaging principle is the same as that of human eyes.

Lens classification

According to the origin of lenses, mainly Japanese lenses and German lenses. Japanese lenses mainly have good color reproduction, while German lenses have a strong sense of layering. China's lens has gradually occupied a certain market in the market, mainly because the price is relatively low.