The Canon WD-H58W Wide Converter Lens for Select Canon HD Camcorders is optically matched to go with the XA10, XA11, XA15, XA20, XA25, XA30, XA35, XF100, XF105, XF200, XF205, HF-G10, G21, G20, and G40 HD camcorders, mounting on the 58mm threads on the front of the lens. The WD-H58W is a converter, as opposed to a wide-angle adapter, which means that with the WD-H58W you can zoom with the converter on your lens, as the wide-angle conversion works across all focal lengths instead of only at the wide end as with adapters.