2x Telephoto Conversion Lens for Panasonic PV-GS150 VDR-M70 M50 Easy to assemble, simply threads to the front of your existing lens system. Doubles your existing optical zoom range. Minimal or no vignette. This new lens, SGT-20 (2.0X telephoto) is designed to work with compact digital and analog camcorders having a 37mm filter thread. Each greatly expands the zoom feature of your camera, the telephoto lens will double your optical zoom, getting you twice as close without resorting to a digital telephoto mode.