zemax can help to design many kinds of optical systems. Here are the basic steps: hDbZ62DDN
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1. make spec for your system p+2uK|T9
2. make initial design P.~sNd oJ
3. choose glass materials zu1gP/
4. analysize the abration and image... Pd(n|t3[8
5. modify and optimze them (this is the core of the design). Si|8xq$E;
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To do these, you need to study basic knowledge of geometric optics.