zemax can help to design many kinds of optical systems. Here are the basic steps: #''q :^EQ
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1. make spec for your system +cw;a]o^>
2. make initial design gDmwJr
3. choose glass materials V0Z\e
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4. analysize the abration and image... :.+?v*%;n
5. modify and optimze them (this is the core of the design). \9S&j(I
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To do these, you need to study basic knowledge of geometric optics.