A "full stop", or Exposure Value (EV) is an aperture unit that halves the amount of light that comes into the camera. There is a full stop between f/1 and f/1.4. There is another full stop between f/1.4 and f/2. The series then goes on f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16 and so on.
If you stop down once from f/4, you will set the aperture to f/5.6, and let half as much light into the camera.
The values can be calculated by multiplying the previous value by the square root of 2. The square root of two is approximately 1.414213562373095048... but luckily camera manufacturers only use one decimal.
No comments:
Post a Comment