f 2.8 

f 16

1. We should closely relate aperture to the pupil of your eye.
2. The smaller the Aperture, the bigger the area of focus.
The larger the Aperture, the smaller the area in focus.
3. When you have a larger number, it means you have a smaller aperture and thats makes the foreground and background become more focused. A when you have a smaller number, it means you have a larger aperture which makes the background less focused than the foreground.

high shutter speed

slow shutter speed

a. high shutter speed

b. high shutter speed

c. high shutter speed

d. high shutter speed

e. slow shutter speed

f. high shutter speed

a. slow shutter speed

b. slow shutter speed

c. high shutter speed

d. high shutter speed

e. slow shutter speed

f. high shutter speed