I am looking at the spectrometer implementation tutorial: https://support.zemax.com/hc/en-us/articles/1500005578862-How-to-build-a-spectrometer-implementation
They say the grating defines the aperture of the system, by which I thought they meant aperture stop. But then they set surface 1 to be the STOP surface. They don’t say why. How do you tell which surface should be the stop for your system?
Best answer by Mark.Nicholson
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