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US 5,448,323 AGranted
Close-up lens assembly incorporating a photo-ranging system
AssigneePolaroid Corporation
InventorsPeter P. Clark, Duncan C. Sorli
Life of this patent
Estimating the term…
Abstract
A plurality of fixed focus exposure lenses are mounted in a turret for manual selection of a desired focus. Each exposure lens in the turret is combined with a pair of ranging lenses for movement therewith which direct light beams to converge at the sharpest subject focus distance of the exposure lens.
Claims15
A camera having more than one film exposure lens with each such lens having a related ranging system, comprising:
- at least two exposure lenses, each of said exposure lenses having a fixed focal length which is different from the focal length of another exposure lens;
- at least two ranging systems, said ranging systems including a source of light directed to a pair of light focusing ranging lenses, with at least one of said film exposure lenses being mounted in fixed relationship between one of said pairs of light focusing lenses and with each of said exposure and ranging lenses being mounted for movement about a common axis, each pair of focusing lenses combining to focus beams of light from said light source to converge at the sharpest subject focus distance of the related exposure lens mounted therebetween;
- and
- an adjustor for locating a desired combination of a pair of light focusing lenses and a related exposure lens in operative position to take a photograph.
1 more element
Dependencies are inferred from the claim text.