Photographic lens system

Details Photographic lens system Photographic lens system

1985-03-21

1987-06-09

Corbin, John K.

350432, G02B 960, G02B 1318

Patent

active

046716262

ABSTRACT:
A photographic lens system of 5-elements comprises from the object side to the image side, a first lens element of a positive lens element having an object side surface convex to the object side, a second lens element of a negative meniscus lens element concave to the image side, a third lens element of a negative lens element having an object side surface concave to the object side, a fourth lens element of a positive meniscus lens element convex to the image side, and a fifth lens element of a positive lens element, wherein an air lens formed between the third lens element and the fourth lens element has a negative refractive power. The air lens is effective for correcting each aberrations.

REFERENCES:
patent: 2748656 (1956-06-01), Berger et al.
patent: 2777363 (1957-01-01), Wanke et al.
patent: 3376090 (1968-04-01), Hudson
patent: 3912379 (1975-10-01), De Jager
patent: 4376571 (1983-03-01), Ikemori

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