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Types of optical systems in a lens designer's toolbox (2020)
This Guide is a birds-eye-view of all the optical systems and lens design forms out there, and will be an essential tool for any lens designer's toolbox.
Sure, the manufacturing of all the cemented surfaces is difficult, but it provided a lens with an F1.5 aperture in a time when this was not possible for Double Gauss lenses due to lack of technological advancements (high index low dispersion glass, anti-reflective coatings, for example). In exact optical ray path terms, the focal point of an eyepiece and the entrance pupil of our eye does not match up perfectly, but this is the equation used to get the numbers for magnification in general. Automatic optimization in lens design alleviated the calculations and solutions to linear and non-linear equations, but on the flip side, made the specifications more complex and forces the output of more and more ideas to more difficult problems.
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