Panchromatic zoom lens for camera - provides increased exit focal length in fixed focus group consisting of four elements (OE 15.6.78)

摘要

The zoom lens has a base gp. (2) of fixed focal length. The front gp. of continuously variable magnification consists of three elements. This gp. (1) has a front element (L1-3) of positive refraction, an axially slidable element (L4-6) of negative refraction and an element (L7) of positive refraction. The latter (L7) permits a macro-photographic position. The rear gp. (2) consists of a positive refraction single lens (L8) behind the diaphragm, a negative refraction single lens (L9) and two positive refraction single lenses (L10-11).