zemax can help to design many kinds of optical systems. Here are the basic steps: n@<YI
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1. make spec for your system t%d Z-Ym
2. make initial design LBw1g<&
3. choose glass materials l!D}3jD
4. analysize the abration and image... 5'OrHk;u
5. modify and optimze them (this is the core of the design). g|o,uD
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To do these, you need to study basic knowledge of geometric optics.