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Aperture is the opening in the diaphragm of a camera lens. For questions relating to Apple's photo management software, please use [apple-aperture] instead.

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What is the -5 to +5 scale below the aperture number on the back of my Canon DSLR?

I've been reading about modes, light, shutter speed, aperture and so on, and to be honest I have clear most things I've read. … It is all beautiful and fairy tails until it comes to this: That number (0) below the aperture number (in this case, F2.8) and next to "AV". What does that scale from -5 o +5 stands for? …
Fabian Vergara's user avatar