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Gummilinse f f =, -n
gen.	zoom
cultur., industr., construct.	variable focus lens
earth.sc., life.sc.	transfocator; variable-focal-length lens
opt.	zoom lens (of variable focal length); vari-focus lens (by means of internal movement of the lens components with respect to each other these lenses can be changed in effective focal length and thus vary the linear magnification); zoom objective (the separation changes between the lens components yield a focal plane which is stationary or does not move outside the limits of depth of focus)
tech.	zoom lens

Gummilinse: 5 phrases in 2 subjects

Computers	3
Optics branch of physics	2