zemax can help to design many kinds of optical systems. Here are the basic steps: )Vk6;__
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1. make spec for your system "SoHt]%#
2. make initial design M4LktR-[
3. choose glass materials +P`(Rf"luu
4. analysize the abration and image... !lmWb-v%36
5. modify and optimze them (this is the core of the design). =AEz9d ciS
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To do these, you need to study basic knowledge of geometric optics.