I get what it does.
My question is my photography teacher says when the reading comes out to 2.808, you would round up to the nearest F-stop whole number, which in F-stops would be 4.0 (1.4, 2, 2.8, 4, 5.6, 8, 11).
I stopped him and said 2.808 rounded up mathematically is 2.81. Wouldn't it be...