Objektiv mit veränderlicher Vergrößerung(providing a continuous range of magnification: by means of internal movement of the lens components with respect to each other these lenses can be changed in effective focal length and thus vary the linear magnification)
Objektiv veränderlicher Brennweite(by means of internal movement of the lens components with respect to each other these lenses can be changed in effective focal length and thus vary the linear magnification)
Objektiv mit veränderlicher Brennweite(by means of internal movement of the lens components with respect to each other these lenses can be changed in effective focal length and thus vary the linear magnification)