Patent ID: 7289272

Claim:
An optical system comprising: a primary lens group having a central beam path therethrough and including: a front lens group, including an optically powered front-lens-group lens that is rotationally symmetric about the central beam path, and a rear lens group including an optically powered rear-lens-group lens that is rotationally symmetric about the central path; an anamorphic lens group lying on the central beam path and positioned between the front lens group and the rear lens group, wherein the anamorphic lens group includes at least one optically powered anamorphic lens that has a different enlargement of a light beam passing therethrough along a first transverse axis positioned locally perpendicular to the central beam path than along a second transverse axis positioned locally perpendicular to the central beam path and locally perpendicular to the first transverse axis; an anamorphic lens group mount; a secondary lens group; a secondary lens group mount, wherein the anamorphic lens group mount and the secondary lens group mount respectively enable the anamorphic lens group and the secondary lens group to be alternately and controllably inserted into and removed from the central beam path; and an image transceiver that is either an image source positioned to direct a light image on the central beam path sequentially through the rear lens group, the anamorphic lens group, and the front lens group, or an image receiver positioned to receive a light image on the central beam path that passes sequentially through the front lens group, the anamorphic lens group, and the rear lens group before reaching the image receiver.