Aperture Aperture is the hardest property for people to understand, but when they do... that's when everything changes.

Inside a lens, are a series of blades which will control the amount of light passing through. The position of these blades is referred to as an "f/stop."

A low f-stop (say, f/1.8) means the maximum amount of light is passing through the lens.

A side effect to a low f/stop is that if my subject is say 10-15 feet away from me, my subject will be in sharp focus, but the background will be blurred.

This is referred to as having a limited depth-of-field and is very common for portraits.

Increasing the f/stop, means that less light is passing through the lens.

The side effect of a high f/stop value means my subject is in focus and (depending on the situation) my background will show greater detail, to a certain degree that is.

This is referred to as having a maximum depth-of-field and is common for landscapes.

"The lower the number, the wider the hole. My subject is in focus, but not much else."

That's a saying I've told people over the years to help them understand what Aperture is about.

Just keep saying that over and over again until it becomes second nature.

In these examples, you can see how the depth-of-field changes from being limited (at f/4.5) to having the background be in focus at f/22.0 and even f/32.0.



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