Canon J17ex7.7B IRSE Broadcast Zoom Lens with 2x extender (7.7-131mm / 14.2-262mm) The Canon J17ex7.7BIRSE is the industry standard broadcast quality SD lens featuring a wide 7.7mm. It's the perfect partner for a wide range of cameras / camcorders including DVW-970 / DVW-790 / DSR-500 / 570 / 450 as well as Panasonic's superb AJ-SDX range of DVCPro camcorders.