Varifocal lenses

Varifocal lenses are lenses with variable focal length, which can be adjusted by moving groups of optical elements with respect to each other inside the lens. The variable focal length allows for multiple combinations of working distances and magnifications, offering several different configurations with a single lens. Varifocal lenses, though, have the same reliability issues of fixed focal length lenses, plus more uncertainty caused by the relative motion of lens groups inside the assembly.

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