Author: Harry Guinness / Source: howtogeek.com
Have you ever wondered what the button next to the lens mount on your DSLR is for? Not the one that you use to detach a lens, but that other one? That’s the depth of field preview button. Let’s dig in.
Depth of Field Redux
The depth of field of an image is how much of it is in focus. An image with a shallow depth of field, like this one, has very little except the subject in focus.
An image like this one with a deep depth of field has pretty much everything in focus.
You control the depth of field by setting the aperture on your lens. A wide aperture gives you a shallow depth of field, while a narrow aperture gives you a deep depth of field. A wide aperture also lets in more light which means you need to use a faster shutter speed.
What You See Through the Viewfinder and the Depth of Field Preview Button
When you look through the optical viewfinder on your camera, you don’t actually see the scene exactly as it will look in your photographs. Since you’re viewing things live, you don’t see the affect of shutter speed in your images. You also don’t see the affect of aperture.
When you use an optical viewfinder, the aperture is set to…
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