Corrective lens assembly

Details Corrective lens assembly Corrective lens assembly

1995-04-14

1997-06-17

Mathews, A. A.

Photography

Having lens converter or extension tube

396140, 396296, 396377, 396544, 348341, G03B 1312, G03B 1314

Patent

active

056406134

ABSTRACT:
A lens assembly, image capturing device and a method for using a lens assembly with an image capturing device. The lens assembly comprises a first lens mounted on a holder which attaches the first lens to a viewing device of an image capturing device. A marking on the first lens is observable through the viewing device when the lens is attached to the viewing device such that the marking is capable of being used to position the lens assembly a properly focused distance from a target having a specified (predetermined) size. The relationship, as seen through the viewing device between the size of the object and the size of the marking may be used to properly position the camera relative to the target object.

REFERENCES:
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patent: 3393623 (1968-07-01), Gutmann et al.
patent: 3699867 (1972-10-01), Wolbarst
patent: 4011571 (1977-03-01), Okuzawa
patent: 4171887 (1979-10-01), Hayata
patent: 4219264 (1980-08-01), Rodeck
patent: 4341449 (1982-07-01), Iwata et al.
patent: 5146256 (1992-09-01), Frosig et al.
Ace Optical Brochure (portions thereof showing snap-on corrective lens); 1993.

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