The exposure index EI for a 35-millimeter camera is a

Last updated: 7/21/2022

The exposure index EI for a 35-millimeter camera is a measurement of the amount of light that hits the film. It is determined by the equation EI = log₂ (+). where f is the "f-stop" setting on the camera and t is the exposure time in seconds. Suppose the f-stop setting is 8 and the exposure time is 4 seconds. What will the resulting exposure index be?