zemax can help to design many kinds of optical systems. Here are the basic steps: Y%"6
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1. make spec for your system RXZ}aX[h
2. make initial design 7 g2@RKo
3. choose glass materials F9Y/Z5 Ea
4. analysize the abration and image... nm3/-Q},
5. modify and optimze them (this is the core of the design). `EjPy>kM
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To do these, you need to study basic knowledge of geometric optics.