I wanted to write you an email because I had a question about the f stop settings. In my critique you had said that I did not pull it off in full stops. I think I am confused as to what constitutes a full stop. When I adjust the f-stop setting up in down it moves from F 4.0, 4.5, 5.0, 5.6, 6.3, 7.1, 8.0, 9.0, 10, 11, 13, 14, 16, 18, 20, 22, 25.
Why is full stops only equal to 1, 1.4, 2, 2.8, 4, 5.6, 8, 11…. and so on?
Sorry if this is confusing. Thank you so much for your help.
Thank you for bringing this up.
In photography we have full stops.
f/1, 1.4, 2, 2.8, 4, 5.6, 8, 11, 16, 22, 32, 45…
When you go from one to the next you are either doubling or halving the amount of light that enters your camera. For example, when you go from f/8 to f/11 the hole in your lens is only half as big as it was. This means you are only letting in half the amount of light.
When you go from f/8 to f/5.6 you are doubling the size of the hole in your lens. You guessed it, you are letting in twice as much light.
Each time you double or half your light, you are moving one full stop.
Now, your camera has some numbers in between. These move in 1/3 of a stop increments. So as I am sure you are already guessing, when you go from f/8 to f/9 you are letting in 1/3 of a stop less of light.
Conversely, when you go from f/8 to f/7.1 you are letting in 1/3 of a stop more light.
The camera companies give you these 1/3 stop increments so that you can have better control of your exposures. The lighting difference is not drastically different from one to another, but it is enough that you can see it.
In this class, we are going to have you work in full stops. It will just help to keep the math easier as we move forward. You will not be tested on these 1/3 stop numbers, only the full stop numbers.
Does this make sense? If not, let me know, I can explain it another way too.
Have a great weekend,