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Is there a Zemax community on this forum? [migrated]

I am new to StackExchange and its constellation of sites. I was wondering if there is a Zemax (optical design software) user group here that I could interact with for all things Optical Design ...
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Intensity loss due to vignetting

I was trying to get an expression for the loss of intensity due to vignetting in a simple optical system, and got a fairly complex integral. I was wondering if there's an easier way, or any book that ...
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Software for geometrical optics

Is there any good software for construction optical path's in geometrical optics. More specifically I want features like: draw $k \in \mathbb{N}$ objects $K_1,\dots,K_n$ with indices of refraction ...