Multiple purpose field increasing optical device

Claim 1

A multiple purpose optical device that may be selectively and removably attached to engageable means on the forward portion of a camera housing containing shutter means and a light sensitive film or corresponding engageable means on the forward portion of a projector, which projector contains a source of light and a holder for said film after it has been exposed and developed, said device when mounted on said camera laterally compressing the light image to which said film is exposed and increasing the field of said camera as a result thereof, and said device when mounted on said projector laterally expanding the developed image on said film as said developed image is reproDuced, with said compression and expansion being to such a degree as to nullify one another and provide a non-distorted and natural reproduction of said developed image on a projection receiving surface, said device comprising: a. a first tubular member having forward and rearward ends, said tubular member having first threads of a first direction defined on the external surface thereof adjacent said forward end; b. primary lens means mounted in said first tubular member; c. engaging means on said rearward end for selectively engaging said engageable means to hold said first tubular member on either said camera or said projector; d. a second tubular member having forward and rearward ends that are coaxially aligned with said first member and disposed forwardly therefrom, said second member having second threads of a second direction formed on the external surface thereof adjacent said rearward ends; e. anamorphic lens means in said second member, said anamorphic lens means having a major axis that must be vertically disposed when said camera and projector are used for taking and reproducing pictures; f. a tubular rigid shell that has first and second threads of first and second directons on the interior surface thereof that engage said first and second threads on said first and second tubular members, said shell serving not only as a connector to hold said first and second tubular members in coaxial alignment, but said shell when rotated relative to both said first and second tubular members longitudinally moving said second tubular member relative to said first tubular member for focusing said primary and anamorphic lens means; and g. guide means interconnecting said first and second tubular members for preventing rotation of said second tubular member when said shell is rotated to focus said primary and anamorphic lens.