title: Three-element zoom lens with fixed distance between focal points.
abstract: This work deals with a theoretical analysis of zoom lenses with a fixed distance between focal points. Equations are derived for the primary (paraxial) design of the basic parameters of a three-element zoom lens. It is shown that the number of optical elements for such a lens must be larger than two.
authors: Czech Technical University in Prague, Faculty of Civil Engineering, Department of Physics, Thakurova 7, 16629 Prague, Czech Republic. miks@fsv.cvut.cz
authors: Antonin
authors: A
authors: Mikš
authors: Jiří
authors: J
authors: Novák
authors: Pavel
authors: P
authors: Novák