Photographic objective of the modified double gauss type

Details Photographic objective of the modified double gauss type Photographic objective of the modified double gauss type

2006-09-05

2006-09-05

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S708000

Reexamination Certificate

active

07102834

ABSTRACT:
A photographic objective of the modified double gauss type is presented. The object has a forward group that includes three lens elements (L1, L2, L3) and has the refractive power sequence ++−. The objective also includes an aperture and a rear group including lens elements (L4, L5, L6) of refractive power sequence −++. The lens element of negative refractive power (L4) is designed as a meniscus with an aspheric surface concave relative to the aperture, and a lens element of negative refractive power (L7) with surfaces concave on both sides is arranged downstream of the last lens element of positive refractive power (L6).

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patent: 22 22 892 (1973-11-01), None
patent: 40 05 300 (1991-08-01), None

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