The Impact DVP-TP20-72 High-grade TelephotoConverter Lens converts the focal distance of the body lens by a factor of approximately 2.0 when attached. The High Grade optics maintains superior image quality and minimizes image distortion. Magnification: 2.0x Rear Mount Diameter: 72mm Front Mount Diameter: 86mm Construction, Elements/Groups: 2 Groups / 2 Elements Lens Diameter: 89mm Length: 60mm Weight: 0.89 lb (405 g)