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Zoom lens, telephoto lens and retrofocus lens

Zoom lens, telephoto lens and retrofocus lens. A zoom lens is a mechanical assembly of lens elements with the ability to vary its focal length (and thus angle of view ), as opposed to a fixed focal length (FFL) lens. . Parfocal lens and varifocal lens:.

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Zoom lens, telephoto lens and retrofocus lens

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  1. Zoom lens, telephoto lens and retrofocus lens A zoom lens is a mechanical assembly of lens elements with the ability to vary its focal length (and thus angle of view), as opposed to a fixed focal length (FFL) lens. Parfocal lens and varifocal lens: A true zoom lens, also called a parfocal lens, is one that maintains focus when its focal length changes. A lens that loses focus during zooming is more properly called a varifocal lens (see also below).

  2. A parfocal lens design Applications: Video, motion picture cameras

  3. A varifocal lens design Application: still camera

  4. Telephoto lens system

  5. Single-lens reflex camera

  6. Shrink system length Schmidt-Cassegrain-Telescope Maksutov-Cassegrain-Telescope

  7. Retrofocus lens system retrofocus Wide field lens system

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