Photographic lens of long back focal length

Details Photographic lens of long back focal length Photographic lens of long back focal length

1987-09-23

1989-08-15

Arnold, Bruce Y.

G02B 964

Patent

active

048568813

ABSTRACT:
A photographic lens of long back focal length comprising, from front to rear, a first lens unit of negative refractive power, the first lens unit including a first lens of positive refractive power whose front surface is convex toward the front, a meniscus-shaped second lens of negative refractive power convex toward the front and a third lens whose front surface is concave toward the front, a stop for determining F-numbers, and a second lens unit of positive refractive power having a plurality of lenses.

REFERENCES:
patent: 3926506 (1975-12-01), Maeda
patent: 4273424 (1981-06-01), Nanjoh
patent: 4346966 (1982-08-01), Nakamura et al.
patent: 4603948 (1986-08-01), Imai
patent: 4660940 (1987-04-01), Ogawa et al.

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