1. Digital Photography Week Two Review Week Two Review

2. Aperture (f-stop) Defined as How much light is allowed into the camera The aperture of the camera works similar to the pupil of your eye. By adjusting your f-stop manually, you can open or close the aperture and allow more or less light in. Typical f-stop values are: 2.8 4.0 5.6 8.0 11 16 22 Note that an f-stop of 2.8 opens much wider than an f-stop of 22. This is because f-stop values are really fractions. The f-stops above have an actual value of: 1 1 1 1 1 1 1 2.8 4.0 5.6 8.0 11 16 22

3. Shutter Speed Defined as: How long light is allowed into the camera How long light is allowed into the camera Typical shutter speeds are: 4 8 15 30 60 125 250 500 1000 2000 4000 Just as with f-stops, the actual values of shutter speeds are fractions. Therefore, a shutter speed of 500 is much faster than a shutter speed of 60. 1 1 1 1 500 60

4. Shutter Speed Guidelines To freeze action, you need a relatively fast shutter speed. The chart below lists some guidelines.

5. Equivalent Exposures Apertures 2.8 4.0 5.6 8.0 11.0 16 22 Shutter speeds 8 15 30 60 125 250 500 1000 2000 Different combinations of f-stop and shutter speed determine how much light enters the camera and for how long. By selecting an aperture (f-stop) and shutter speed manually, WE DETERMINE exposure. The combinations below will result in similar exposures by manipulating both f-stop and shutter speed to determine the equivalent total energy of light entering the camera. 1/125 at f/11 1/250 at f/8 1/500 at f/5.6 1/1000 at f/4 By increasing the speed of the shutter, we decrease the amount of time light is allowed to enter. Therefore, opening the f-stop one stop more will allow more light in and produce an equivalent exposure.