How to choose a camera lens

In different usage situations, the camera lens should be selected according to different usage requirements. Conventional camera lenses include the following types:

Moving aperture fixed focus lens, this kind of lens aperture It can be changed, but the focal length cannot be changed. It is suitable for occasions with fixed focal length and little change in light brightness; manual aperture zoom lens, the application method is the same as above, but in some situations, the lens is used when the range and distance of the shooting environment are not determined; automatic aperture fixed focus Lens, when the ambient illumination changes, this lens uses the signal amplitude output by the camera brightness level to drive the lens aperture motor to automatically adjust the size of the aperture to ensure that the illumination falling on the target surface is constant. It is suitable for situations where illumination changes greatly and the camera focal length is fixed; automatic aperture zoom lens, the application method is the same as above. In some situations, the lens is used when the range and distance of the camera environment are not determined; variable lens. The aperture and focal length of this kind of lens are adjusted by electric control. This lens generally has a longer focal length and a larger zoom range. The aperture is controllable and can be controlled by remote control. It is used in general engineering.