How to adjust the aperture of the lens?

When adjusting the iris, the iris is always in a larger aperture state. Only when the shutter button is pressed to release the shutter, the aperture automatically shrinks to the set f-factor, and the aperture returns to a larger aperture after exposure.

What is the lens? The lens has two fingers in film and television, one refers to the optical components used by movie cameras and projectors to generate images, and is composed of multiple lenses. A variety of different lenses have different modeling characteristics. Their application in photographic modeling constitutes an optical expression method; the second refers to a continuous picture taken from power-on to power-off, or a segment between two splicing points , Also called a ytterbium. One finger and two fingers are two completely different concepts. In order to distinguish the difference between the two, one refers to the optical lens and the two refers to the lens image.

The lens referred to in film and television is not a lens in a physical or optical sense, but a lens that carries an image and can form a picture. The lens is the basic unit that composes the entire film. Several shots constitute a paragraph or scene, and several paragraphs or scenes constitute a film. Therefore, the lens is also the basic unit of visual language. It is the basis of narrative and expression. In the pre-shooting of film and television works, the lens refers to the sum of a section of pictures taken by the camera from start to standstill; in the post-editing, the lens is a set of pictures between two editing points; in the finished film, one The lens refers to the complete segment from the previous optical transition to the next optical transition.

The main function of the lens is to collect the reflected light from the illuminated object and focus it on the CCD. The image projected on the CCD is upside down. The camera circuit has the function of reversing it, and its imaging principle is the same as that of the human eye.

Lens classification: According to the origin of the lens, it is mainly Japanese lens and German lens. Japanese lenses mainly have better color reproducibility, and German lenses have a stronger sense of layering. On the market, Chinese lenses are gradually occupying the market, mainly because the prices are relatively low.

Post time: Oct-08-2021