This Canon W80-iiiB .8x Wide Angle Converter Lens for ENG / EFP Lenses is a 0.8x wide angle converter lens for center depth Canon ENG and EFP broadcast lenses. It's an attachment lens that features full zoom-through capability. It attaches by one of two separately-sold Canon lens adapters -- the Canon 85iii for attaching onto a lens with an 85mm outer diameter, and the 98ii for a 98mm outer diameter lens.
Although this Converter can be attached to size-compatible HD lenses, doing so is strongly recommended against. Please see the SD lens compatibility list below for a full list of compatible 85mm and 95mm outer diameter lenses. (For HD lenses, Canon offers the W80HD.)
Full Zoom-Through Converter Attachment
Attaches to an 85mm outer diameter lens via a Canon 85iii adapter, and onto a 98mm outer diameter lens via a Canon 98ii adapter.