zemax can help to design many kinds of optical systems. Here are the basic steps: `8%2F}x}qD
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1. make spec for your system u%vq<|~-
2. make initial design jn9KQe\3
3. choose glass materials ;'r} D!8w/
4. analysize the abration and image... R1X{=ct
5. modify and optimze them (this is the core of the design). Yvu!Q
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To do these, you need to study basic knowledge of geometric optics.