Macro-focus zoom lens

Details Macro-focus zoom lens Macro-focus zoom lens

1984-05-11

1986-03-18

Corbin, John K.

G02B 936, G02B 1522

Patent

active

045764441

ABSTRACT:
This invention relates to a macro-focus zoom lens in which five lens groups of a refractive power arrangement of negative, positive, negative, positive and positive are allowed to have a macro-focusing function. As zooming performs from a tele to a wide angle, a second lens group and a fourth lens group is moved as a variator towards an image, a first lens group is moved as a compensater, and a third lens group and a fifth lens group are fixed. When the second group and fourth group are moved from the wide angle end to the object side, macro-focusing becomes possible to make. This involves less variation in aberration as compared with macro-focusing by other methods and a lens mount is also simple in construction.

REFERENCES:
patent: 3912376 (1975-10-01), Ogura et al.

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