Definitions for "F STOP"
Keywords:  focal, lens, aperture, diameter, cctv
Number that equals the focal length of the lens divided by the diameter of the aperture.
It is the number that equals the lens' focal length divided by the diameter of the aperture. The smaller the F stop value, the more light you are allowing into the camera at any one time.
The measurement of light able to pass through the photographic lens.