zemax can help to design many kinds of optical systems. Here are the basic steps: 7N0m7SC
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1. make spec for your system YGi_7fTyc=
2. make initial design ktv{-WG2_
3. choose glass materials ">s0B5F7
4. analysize the abration and image... %Ip=3($Ku[
5. modify and optimze them (this is the core of the design). |\]pTA$2
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To do these, you need to study basic knowledge of geometric optics.