zemax can help to design many kinds of optical systems. Here are the basic steps: b1+6I_u.
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1. make spec for your system vjo@aY.x
2. make initial design :LE0_ .
3. choose glass materials X;2I'
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4. analysize the abration and image... 8H2zMIB
5. modify and optimze them (this is the core of the design). XKp$v']u
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To do these, you need to study basic knowledge of geometric optics.