The manual states that ISFN returns a paraxial-only f/# and WFNO returns a real-ray f/#. Nothing is said about ISFN accounting for vignetting. WFNO allegedly accounts for vignetting following a SETVIG or SVIG operand. However, I’m not seeing this happen with WFNO in a vignetted system, as the focal ratios are identical to 6 digits for both unvignetted and vignetted analysis. I’m also not seeing either SFNO or TFNO accounting for vignetting, either. The manual does not state whether they are based on paraxial or real-ray analysis. Is this another example of users having to write a macro to make Zemax do what the manual says it is supposed to already be doing?
Question
WFNO, SFNO and TFNO don't account for vignetting after SETVIG or SVIG?
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