The relationship between NA and f/ number is NA = 1/(2f) where f is the f/ number. f/0.5 means NA =1, and so on.
NA is defined concisely here: http://micro.magnet.fsu.edu/primer/a...maperture.html
The relationship between NA and f/ number is NA = 1/(2f) where f is the f/ number. f/0.5 means NA =1, and so on.
NA is defined concisely here: http://micro.magnet.fsu.edu/primer/a...maperture.html