CANON J17ax7.7 B4 IRSD 2/3 inch SDTV Internal Focus Broadcast Lens with 2x Extender. Canon has developed breakthrough optical design concept using a newly developed optical element in the most effective way. They named the new design concept the "Power Optical System" which can achieve higher specifications and quality in smaller size and lighter weight, using the new optical "X-Element" which realize complete elimination of its aberration. Canon 16x9/4x3 crossover system for switchable cameras is available as an option (WRS/WAS). Zoom Ratio: 17x Range of Focal Length: 7.7-131mm (with Extender): 15.4-262mm M.O.D.: 0.60m Built-in Extender: 2.0x. This lens will fit any 2/3" (b4 mount) camera including the following: Sony DXC-537/637/D30/D35/D50/D55, BVW-D600, DSR-400/450/500/570, DVW-700/709/790, Panasonic AJ-SDX900, AJ-HDX900, AG-HPX500, AG-HPX555, AJ-HPX2000/3000, AJ-HDC27F, AJ-SPC700, AJ-SPX800, AJ-SDC615...and many more.