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.
from How-To Geek https://www.howtogeek.com/359258/what-does-the-depth-of-field-preview-button-do-on-your-camera/
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