Canon's WD-H58W 0.8x Wide Converter Lens is optically matched to go with the XA10 HD camcorder, but it is also compatible with other Canon camcorders and can be attached to any lens with a 58mm filter thread. The WD-H58W brings a wider angle of view to your images, for example converting the XA10's 30.4mm lens into 24mm and allowing you to pack more of your subject into the frame. This comes in handy when shooting groups of people, small rooms, or wide landscapes.
Reviewed by 3 customers
If you shoot conference rooms, meetings, etc. this will open up your shot to encompass more of the room. It's not like using a 14mm lens, but it does pull in a little more of the room and attendees. Not a 'must-have' but definitely a 'nice-to-have' accessory. I did not notice any degradation of the image quality when attached, in fact, I just leave it on most of the time.
I'm using this adapter on the Canon Vixia HF G10. Results are excellent with just the slightest softening of the image and maybe a third of a stop of light loss. The only real downsides to this lens are the weight - it weighs almost as much as the camera - and the price. On the other hand, you get what you pay for: an excellently crafted lens that performs as advertised.
I have been greatly impressed by this wide angle lens, attached to my canon xa10 camcorder. Very clean output, with no visible vignetting at any zoom level. As i struggled so much in getting a clear understanding of the field of view enlargement i could expect before buying it, i decided to publish some test footage with and without the wd-h58w. It here: http://m.youtube.com/watch?v=wzCrYQ9pqeo#Only wish this will help potential buyers to go for it ... [$] is not cheapy, so better test before you buy !