Photographic objective of reduced size

Details Photographic objective of reduced size Photographic objective of reduced size

1981-08-10

1983-02-15

Corbin, John K.

350469, G02B 304, G02B 934

Patent

active

043737862

ABSTRACT:
The disclosed photographic objective includes, from front to rear, a meniscus first lens of positive power convex toward the front, a bi-concave second lens, a bi-convex third lens, and a negative-power fourth lens whose front surface is concave toward the front and aspherical. The form of each of the lenses, the glass material, and the air separations between the successive lenses being chosen to reduce the overall size of the objective while still permitting good correction of aberrations.

REFERENCES:
patent: 2446402 (1948-08-01), Aklin
patent: 3951523 (1976-04-01), Nishimoto
patent: 3998527 (1976-12-01), Ikada et al.
patent: 4124276 (1978-11-01), Okano et al.

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