Aperture

 

 F2.8

F16

We should closely relate aperture to our eye pupil. The smaller the aperture the more deep or good depth of field the image is focused on, the higher the aperture it gives a shallow depth which doesn't make the image focused. A large F-number means smaller aperture will bring all foreground and backgrounds in focus but with a smaller F-number would isolate the foreground from the background and make the direct object in focus and make the background blurry. The F stops on my camera are F4, F4.5, F5, F5.6, F6.3, F7.1, F8, F9, F10, F11, F13, F14, F16, F18, F20, F22, F25