Comment on conversion lenses: they are afocal too!.Afocal lens systems: manipulating rays to get them to behave the way we want.Zoom lenses: How we can get many focal lengths in one lens system.The Fisheye lens: Testing the limits of Field of View.Imaging lenses: Specific use lens systems.The Retrofocus / Reverse telephoto lens: The practical solution to wide angle lenses on SLRs and digital sensors.The Telephoto lens: The telephoto lens: The term that is confusing for photographers(but not lens designers).The symmetric wide angle lens: The quest for Field of View.The Double Gauss lens: The winner of the standard lens on a photographic camera.
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