Quote:
Stops are factors of two.


And the very confusing "full" F-stop numbers (1.0, 1.4, 2.0, 2.8, 4.0, 5.6, 8.0, ...) are approximate square roots of those various powers of two.

EDIT: Each successive number in that sequence (above) represents a halving of the amount of light getting to the film/sensor. So f2.0 means *double* the brightness of f2.8..

Knowing that helped me a lot when I was first learning about this stuff 30 years ago.

Cheers


Edited by mlord (23/03/2007 14:10)