tech

how much light is an f-stop? QUICK ANSWER An f stop is a measure of a geometric incremented pattern based upon the powers of the square root of 2 (1.4). This gives a geometric scale of:  f1.0  f1.4  f2.0  f2.8  f4  f5.6  f8  f11  f16  f22  f32  f45 Every stop lets in half as much light as the number goes up. E.g. f1.4 will let in half as much light as f1.  A camera lens that opens to f4 will need four times the amount of light as a camera lens that opens to f2 and