Telephoto lens of large aperture ratio

Details Telephoto lens of large aperture ratio Telephoto lens of large aperture ratio

1988-02-24

1989-08-01

Arnold, Bruce Y.

350450, G02B 1302, G02B 964

Patent

active

048529842

ABSTRACT:
A telephoto lens comprising, from front to rear, a first lens unit including a lens of negative power with its rear surface concave toward the rear and whose overall power is positive, a second lens unit of negative power axially movable for focusing, and a third lens unit of positive overall refractive power having a negative lens whose front-most lens surface is concave toward the front and at least two positive lenses.

REFERENCES:
patent: 4732459 (1988-03-01), Hayashi

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