zemax can help to design many kinds of optical systems. Here are the basic steps: O<`,,^4w/
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1. make spec for your system _+n;A46
2. make initial design r--;yEjWE
3. choose glass materials u~}%1
4. analysize the abration and image... 4>_d3_1sn
5. modify and optimze them (this is the core of the design). g}r^Xzd;
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To do these, you need to study basic knowledge of geometric optics.