SLR camera lens which is divided into several?
However, the zoom lens due to its optical system and mechanical structure is more complex, so processing and manufacturing more difficult, subject to price, size and weight constraints. The relative aperture of the zoom lens can not be made very large, sometimes to reduce the volume or to ensure aberration, the lens can only change the aperture.
(3) according to the focal length of the lens can change, can be divided into fixed focus lens and zoom lens two categories.
Due to the level of optical design, the rapid increase in optical glass melting technology, the relatively rich photographers at hand have the potential to choose the focal length can be changed within a certain range and remain as immobile optical system. This can change the focal length in a certain range, so as to get different width of the field of view, different sizes of images and different scene range of the camera lens called zoom lens, referred to as zoom lens. Zoom lens does not change the shooting distance, you can change the focal length to change the shooting range, it is very conducive to the composition of the screen. As a zoom lens can take on the role of a number of fixed focus lens, travel not only reduce the number of carrying photographic equipment, but also save the time to replace the lens. At present, foreign production of high-end automatic fool camera almost all equipped with a small zoom ratio zoom lens.
Zoom lens according to the different zoom mode, can be divided into two kinds of single ring and double ring. Single-ring zoom lens, zoom and focus using the same pull ring, push it zoom, turn it focus; the advantage is easy to operate, quickly. Double-ring zoom lens, zoom and focus on each side with a ring, respectively; the advantages of zoom and focus do not interfere with each other, the higher the accuracy, but the operation is more trouble. In the current market zoom lens, some in the front of the lens is also marked with "Micro" words, meaning for macro photography, but also for ultra-near photography, such a zoom lens is more versatile.
(2) according to the lens of the condenser ability is divided into ultra-transparent lens, the relative size of the relative aperture of the camera should be more than 1: 2.8; strong transparent lens, 1: 3.5 ~ 1: 5.8; normal light transmission lens , 1: 6.3 ~ 1: 9; weak light transmission lens, less than 1: 9.
