Shutter Speed

Shutter Speed - How fast the shutter opens and closes

f/250th of a second is large
f/50th of a second is small
Slow shutter speed is for dark conditions
Fast shutter speed if for capturing fast objects

Aperture is usuallyexpressed in f-numbers
f/2.1 is large
f/2.2 is small

High number - A smaller hole
The higher the number the higher the depth of field

Clock captured in focus