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I'm looking for resources (either online or printed) about lens design.
I have an understanding of physics, but I'm not an optical engineer. Something addressed more to a photographer than a specialist in optics.
I need the sort of information that would help me understand why a lens is designed in a certain way, why so many elements and groups, why this or that type of glass. Must be more on a cause-effect base than on a in-depth scientific explanation.
Thank you all!