zemax can help to design many kinds of optical systems. Here are the basic steps: 1dahVc1W
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1. make spec for your system ?oO<PR}y
2. make initial design V[T`I a\
3. choose glass materials l2LUcI$ x
4. analysize the abration and image... (r+#}z}
5. modify and optimze them (this is the core of the design). pv #uLo
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To do these, you need to study basic knowledge of geometric optics.