zemax can help to design many kinds of optical systems. Here are the basic steps: RgLk AHA
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1. make spec for your system fP;2qho
2. make initial design ~Ut?'}L(
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3. choose glass materials ;-!O+c
4. analysize the abration and image... y.?Q
5. modify and optimze them (this is the core of the design). !-s 6B
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To do these, you need to study basic knowledge of geometric optics.