All Questions
1
question
1
vote
2
answers
2k
views
What is the quantitative relation between f/# of the lens (aperture), exposure, and ISO?
Let's say we shoot with a DSLR camera and we have two interchangeable lenses.
Lens #1 has aperture f/X, X between 1 and 2 (see below).
Lens #2 is f/4.5. Same focal length and other characteristics as ...