Method to increase focal distance at telephotographic side of a

Details Method to increase focal distance at telephotographic side of a Method to increase focal distance at telephotographic side of a

1976-11-15

1983-07-05

Corbin, John K.

350427, G02B 1502, G02B 1516

Patent

active

043914934

ABSTRACT:
The focal length at the telephoto end of a zoom lens is increased by making the magnification of the system .beta. with auxiliary focusing means while the ordinary focusing means of the zoom lens system is focused on infinity. An attachment lens having a focal length fA is provided in front of the zoom lens system in such a manner that the composite lens system is focused on infinity. The product fA .beta. of the magnification .beta. and the focal length fA of the attachment lens is longer than the focal length of the zoom lens.

REFERENCES:
patent: 2559844 (1951-07-01), Bennett
patent: 3784284 (1974-01-01), Nakamura

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