Vari-focal lens system with switchable auxiliary lens units

Details Vari-focal lens system with switchable auxiliary lens units Vari-focal lens system with switchable auxiliary lens units

1988-11-07

1990-04-03

Dzierzynski, P. M.

350254, G02B 1502

Patent

active

049135376

ABSTRACT:
A vari-focal lens system with switchable auxiliary lens units comprising a master lens system, an auxiliary lens unit removably arranged after the master lens system and another auxiliary lens unit removably arranged after said auxiliary lens unit, said vari-focal lens system being so adapted as to permit photographing at multiple different focal lengths by speedy switching operation with a simple mechanism.

REFERENCES:
patent: 3817599 (1989-05-01), McCrobie

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