zemax can help to design many kinds of optical systems. Here are the basic steps: *xB9~:
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1. make spec for your system ]eA<
2. make initial design IxC/X5Mp^q
3. choose glass materials .-[uQtyWW
4. analysize the abration and image... ])paU8u
5. modify and optimze them (this is the core of the design). OoOKr
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To do these, you need to study basic knowledge of geometric optics.