Patent
Large aperture ultra wide angle photographic lens system
TLDR
In this paper, a large-aperture ultra-wide angle photographic lens system which is compatible with filters designed for use with other lens systems and wherein various aberrations are favorably corrected is presented.Abstract:
A large-aperture ultra-wide angle photographic lens system which have such a small lens diameter as to be compatible with filters designed for use with other lens systems and wherein various aberrations are favorably corrected.read more
Citations
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Ultra wide-angle lens
TL;DR: In this article, an ultra wide-angle lens with a sequence of lens elements comprising, from the object plane to the image plane, a front group (I) with a first lens arranged as the front lens (1) and formed as a positive meniscus lens, of which the object-side surface has a smaller radius of curvature than the image side surface.
References
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Patent
Retrofocus-type wide-angle photographic lens system
TL;DR: A retrofocus-type wide-angle photographic lens system having a predetermined airspace in said lens system and arranged to be focused for close-up photographing and to prevent aggravation of aberrations by moving a front lens group positioned on the object side of said airspace toward a rear lens group located on the image side of the airspace at the same time as advancing the lens system as a whole is described in this article.
Patent
Large-aperture, ultra wide angle photographic lens system
TL;DR: In this article, a large aperture, ultra wide angle photographic lens with a thick lens and another thick doublet lens which are arranged before a stop and after a stop are arranged.
Patent
Retrofocus-type ultra-wide angle photographic lens system
TL;DR: A retrofocus-type ultra-wide angle photographic lens system with a front negative lens group comprising one or two positive meniscus lenses and three or four negative lens groups is described in this article.