What is F-Stop?

The f-stop number is actually a fraction, F/16 means 1/16. This represents the size of the "hole".

It's main impact is the depth of field of the photograph. The larger the fraction = the more greater the depth of field.

Secondly, it impacts the amount of light that comes in. The larger the fraction, the less light it lets in.

**You'll be safe if you shoot with the f-stop on 5.6 or 8**

TIP: I don't think of the numbers as a fraction, i see 16 and think 16 not 1/16, therefor I remember it as...

For field of depth... "numbers correlate"

the bigger number = bigger depth of field

the smaller number = smaller depth of field

For lighting... "it's the opposite".

the bigger number = less light,

the smaller number = more light