关于F#的问题
哈哈,这个问题我能回答。
LENS Design中对这是这么描述的:
We saw the three distinct f-numbers shown in ZEMAX’’s General Lens Data list. The traditional f-number is given by th image space f-number. what about the other tow? Consider a ray parallel to the optical axis incident on a thin singlet at a height y.U is the bend angle.
image space f-number: f#=EFL/EPD
paraxial working: f#=1/2tanU
working f#=1/2SinU