Zoom lenses are advanced vario lenses. We can vary their focal length (colloquially, "to zoom" the lens) and they remain focused.
Zoom Lenses are used to provide adjustable image magnification for a number of imaging applications such as microscopy or inspection. Zoom Lenses are imaging lenses designed to be integrated into imaging systems. Zoom Lenses may be offered with manual or motor controlled magnification capabilities that can be adapted to multiple imaging requirements. Zoom Lenses also refocus as