Author Question: I take two pictures of my dog Kaycee. I use the same film and level of illumination for both ... (Read 81 times)

Ebrown · **on:** Jul 28, 2018

I take two pictures of my dog Kaycee. I use the same film and level of illumination for both pictures, but I halve the f-number for the second picture. By what factor will the required time of exposure change if the film is to receive the same total light energy?
a. 4.0
c. 2.0
b. 0.50
d. 0.25

Question 2

Doubling the f-number of a camera lens will change the light intensity admitted to the film by what factor?
a. 1/4
c. 1/2
b. 4
d. 2