As an important part of the low-light camera, the lens function is to focus the desired light of the subject for the camera's Sensor, so that the image is normal. The amount of light that can be captured by the lens directly determines the sharpness of the CCD or CMOS sensor image. Therefore, the condition of how much light is taken on the lens is measured, and we call it the amount of incoming light F. The amount of light entering the lens is expressed by the application of the F value (aperture). F value = f (focal distance) / D (effective aperture of the lens), which is inversely proportional to the aperture, and is proportional to the distance from the focal point. With the same focal length, the larger the aperture of the lens, the smaller the F value and the greater the amount of light entering the lens. The F value of the common lens is mostly 1.2, 1.4, of course, there are currently shots up to F1.0, but after all, it is a minority. Therefore, in order to make the low-light camera get excellent low-light effect, with the appropriate F-value lens has become the key factor.
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