zemax can help to design many kinds of optical systems. Here are the basic steps: HE,L8S
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1. make spec for your system js<d"m*
2. make initial design xmv%O&0^}
3. choose glass materials ;7lON-@BI
4. analysize the abration and image... wQ/* f9
5. modify and optimze them (this is the core of the design). T;/GHC`{Y
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To do these, you need to study basic knowledge of geometric optics.