A camera lens is initially set at f/32 for a shutter speed of 1/15 s.If the amount of lighting on the subject is unchanged,and the lens is set at f/16,what is the proper shutter speed at this setting?
A)1/60 s
B)1/2 s
C)1/125 s
D)1/30 s

Question

Quizplus · Accepted Answer

When the lens setting is changed from f/32 to f/16, the light entering the camera is doubled (since f/16 is twice as wide as f/32). To maintain the proper exposure, the shutter speed must be halved (doubled shutter speed means half the amount of time the sensor is exposed to light). Therefore, the proper shutter speed at f/16 setting would be 1/60 s, which is half the shutter speed of 1/15 s at f/32 setting. The other choices are incorrect as they do not take into account the relationship between aperture and shutter speed in maintaining the same exposure.

A Camera Lens Is Initially Set at F/32 for a Shutter