1. When employing multiple flash exposures to a moving subject (like the Edgerton strobe photos) why is it important to photograph against a black background?
In order to provide contrast with the subject that is being illuminated. If a white background were used the subject would not stand out and it would be overexposed due to the additional reflective light from the background.
2. In a given situation when one flash discharge is used to correct f-numbr to achieve correct exposure is f8. How many identical discharges would you need to achieve correct exposure when using f32?
Five
3. Explain your answer in the last question.
If f/8 is the correct exposure the intensity of the light or the number of flashes has to increase to compensate for the closure of the aperture to f/32. There are 5 stops f/8, f/11, f/16, f/22 and f/32 requiring one flash for each stop.
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