Century Optics .3X HD Ultra Fisheye Adapter for Canon XH-A1, XH-G1 & XL-H1
Not a zoom-through; vignetting will occur at extreme wide angle.
When you're shooting for a truly exaggerated point of view, twist on the Century .3X Ultra Fisheye Adapter.
The Fisheye gets you the widest view possible, with extreme barrel distortion. This non-zoom-through attachment provides over 130 degree horizontal angle of view.
The fisheye exaggerates depth, pulling nearby objects closer, and causing distant objects to recede into the background. A fixed adapter, the Fisheye doesn't allow for zooming, but for the most pronounced effect, you'll want to stay at the wide end of the range anyway. Note that vignetting will occur at extreme wide angle.
Comes in popular Bayonet Mount that attaches with a twist to the front of the lens.