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.

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Presentation transcript:

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.lens elementsfocal lengthangle of view 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).parfocal lensvarifocal lens Parfocal lens and varifocal lens:

A parfocal lens design Applications: Video, motion picture cameras

A varifocal lens design Application: still camera

Telephoto lens system

Single-lens reflex camera

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

Retrofocus lens system Wide field lens system retrofocus

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