A camera lens is initially set at f/8 for a shutter speed of 1/250 s.If the amount of lighting on the subject is unchanged,and the lens is set at f/4,what is the proper shutter speed at this setting?
A)1/1000 s
B)1/500 s
C)1/250 s
D)1/2 s
E)1/8 s

Question

A camera lens is initially set at f/8 for a shutter speed of 1/250 s.If the amount of lighting on the subject is unchanged,and the lens is set at f/4,what is the proper shutter speed at this setting?
A)1/1000 s
B)1/500 s
C)1/250 s
D)1/2 s
E)1/8​ s

Quizplus · Accepted Answer

The f-stop f/4 allows four times more light than f/8. To maintain the same exposure, the shutter speed must be four times faster, changing from 1/250 s to 1/1000 s.

A Camera Lens Is Initially Set at F/8 for a Shutter