When zooming in on an object with varifocal or zoom lens, light sensitivity of the camera is
A) increasing
B) decreasing
C) the same
D) dependent on lens

Question

Quizplus · Accepted Answer

When zooming in with a varifocal or zoom lens, the aperture of the lens decreases to maintain a constant exposure. This means that less light is getting through to the camera sensor, resulting in a decrease in light sensitivity (also known as ISO).

When Zooming in on an Object with Varifocal or Zoom