zemax can help to design many kinds of optical systems. Here are the basic steps: @gw8r[
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1. make spec for your system Lb{.}
2. make initial design NCgKWyRR
3. choose glass materials $oPc,zS-gL
4. analysize the abration and image... r;+a%?P
5. modify and optimze them (this is the core of the design). (O&HCT|
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To do these, you need to study basic knowledge of geometric optics.