Aperature

[F2.8]

[F16]

1. Our eyes

2. The smaller the Aperature, the larger f-stops. The larger the Aperature, the smaller f-stops.

3. The section of the picture that comes out clear or "sharp".

4. F3.5, F4.0, F4.5, 5.0, F5.6, F6.3, F7.1, F8.0, F9.0, F10, F11, F13, F14, F16, F18, F20, F22