Wide-angle photographic lens system

Details Wide-angle photographic lens system Wide-angle photographic lens system

1994-03-11

1996-08-13

Nelms, David C.

Optical: systems and elements

Lens

Multiple component lenses

359795, 359784, 359785, 359793, G02B 1502

Patent

active

055462367

ABSTRACT:
A wide-angle photographic lens system comprising a front lens unit having a positive refractive power, an aperture stop and a rear lens unit having a positive refractive power or a negative refractive power; the front lens unit comprising at least one positive lens component and at least one negative lens component, whereas said rear lens unit consisting of a positive lens component having a convex surface on the image side. This photographic lens system has a short total length (a length as measured from a first surface to an image side surface of the lens system and a small value of .SIGMA.d (a distance as measured from the first surface to a final surface thereof), and is suited for use with collapsible mount type cameras.

REFERENCES:
patent: 4666257 (1987-05-01), Tanaka et al.

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