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Internal structure of the lens
2024-04-23
The internal structure of the lens is very complex, and it is also the part that best reflects the quality of a lens, which is directly related to the imaging quality. This part is invisible to us and is generally composed of multiple sets of lenses with complex structures. Different lens processing methods and materials are different. The quality of the lens is not simply proportional to the number of lenses, which requires attention.
In addition to the lens, the lens is also used to adjust the amount of light into the aperture blade, it is similar to the pupil of the expansion and contraction of the action, control the amount of light, the shutter speed, depth of field and so on. Some lenses with anti-shake function will also have motor-driven anti-shake components in the internal structure. In addition, if the lens uses a lens body motor, there will also be a moving lens to control autofocus.
focal length of the lens
The two most obvious indicators that distinguish different lenses are focal length and aperture. First of all, the focal segment, the camera lens is a group of lenses, when parallel to the main optical axis of the light through the lens, will focus on a point, this point is called the focus, focus to the center of the lens (I. e., the optical center) distance, it is called the focal length. Fixed focal length of the lens, that is, fixed focus lens; focal length can adjust the change of the lens, is the zoom lens.
The focal length of the lens is now basically in mm. The larger the value, the longer the focal length, the narrower the angle of view, that is, the farther you see. The smaller the value, the shorter the focal length, the wider the angle of view, that is, the larger the range of scenery contained in the picture. Can change the focal length of the lens called zoom lens, can not change the fixed focus lens.
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