How to use the zoom lens

Introduction: For digital SLR lenses, we usually do not mention the concept of "several times of zoom". So how should a zoom lens be used? Come with me and take a look! How to use a zoom lens

Like a fixed focus lens, we also examine it through the focal length. But for zoom lenses, there are two focal lengths. One is the focal length at the wide-angle end (Wide), and the other is the focal length at the telephoto end (Tele). The focal length of a zoom lens can continuously change within these two values.

It is worth noting that for digital SLR lenses, we usually do not mention the concept of "several times of zoom". Give a very simple example, I believe everyone will understand. A zoom lens with a focal length of 24 to 70mm and a zoom lens with a focal length of 70 to 200mm can both be called 3x optical zoom (the calculation method of how many times the zoom is is: the focal length of the telephoto end divided by the focal length of the wide-angle end, The resulting number is the zoom factor. 70/24 and 200/70 are both slightly equal to 3, so we can both think of it as 3x optical zoom). But obviously, the scope of application of the two is completely different. The 24-70mm lens is suitable for shooting landscapes and portraits, while the 70-200mm lens is more suitable for shooting ecological, sports, stage and other themes. Therefore, for a digital SLR lens, it doesn’t mean much to talk about the zoom factor. What we value more is its focal length.

However, on the other hand, it must be admitted that the greater the zoom factor of the lens, the wider the range of applications of this lens. For example, an 18-200mm lens has focal lengths ranging from wide-angle to telephoto, so it is suitable for almost any shooting subject. With such a lens, you can "cover the world with one lens", and it is very convenient to use. ? Like fixed focus lenses, we also examine them by focal length. But for a zoom lens, there are two focal lengths. One is the focal length at the wide-angle end (Wide), and the other is the focal length at the telephoto end (Tele). The focal length of a zoom lens can continuously change within these two values.

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. It is composed of multiple lenses. Various lenses have different modeling characteristics, and their application in photographic modeling constitutes a means of optical expression; the second refers to a continuous picture taken from startup to shutdown, 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, the first finger is often referred to as the optical lens and the second finger is referred to as the lens screen.

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

The shot is the basic unit that makes up 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 representation. In the early shooting of film and television works, the shot refers to the sum of a period of footage taken continuously by the camera from startup to stillness; in post-editing, the shot is a group of frames between two editing points; in the finished film, a A shot is a complete segment from a previous optical transition to a subsequent 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 onto the CCD is inverted. The camera circuit has the function of inverting it. Its imaging principle is the same as that of human beings. Eyes are the same.

Lens classification

According to the origin of the lens, it is mainly classified into Japanese lenses and German lenses. Japanese lenses mainly have better color reproduction, while German lenses have a stronger sense of layering. On the market, Chinese lenses are gradually occupying a certain market, mainly because of their relatively low prices.