Bildschnittweite(distance; the distance measured from the vertex of the back surface of the lens to the rear focal point; it determines the space available between the lens and the camera film plane)
Varioobjektiv(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)
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)
Zoom-Objektiv(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)
Gummilinse(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)