Question

What is Aperture measured in?

Answer 1

When you want a smaller aperture, you close the hole to let less light in. Aperture is measured in units called f-stop. Now the f-stop can be confusing at first because a smaller f-stop value indicates a larger aperture, while a bigger f-stop value indicates a smaller aperture.

Answer 2

Answer:

The aperture is the opening at the rear of the lens that determines how much light travels through the lens and falls on the image sensor. The size of the aperture's opening is measured in f-stops – one of two sets of numbers on the lens barrel (the other being the focusing distance).