Patent
1982-01-15
1984-03-20
Corbin, John K.
350450, G02B 964, G02B 1304
Patent
active
044377355
ABSTRACT:
The wide angle objective of the inverted telephoto type with a high relative aperture. It includes from front to rear, a first lens group of negative power, a second lens group of positive power and a third lens group of positive power, well corrected for the various aberrations with predetermined conditions for the focal length of each lens group, lens form and refractive indices of the glasses of the lens elements.
REFERENCES:
patent: 3877795 (1975-04-01), Yamashita
Canon Kabushiki Kaisha
Corbin John K.
Gass Rebecca D.
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