If I have a broadband sequential imaging lens design with 100mm aperture but one wavelength only is delivered via a beam-splitter of smaller diameter (~40mm) placed in front of the lens, how do I set this up to optimise without actually having to include the beam-splitter in front? Can I put some kind of zero thickness mask in front which retricts the diameter of the one wavelength only but is invisible to the rest?
Best answer by Mark.Nicholson
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