Just a short comparison of two 58mm wide angle lens adapters for my 550D kit lens. These are all over ebay and super cheap.
**UPDATE**. I often receive the same questions in the comments regarding the exact lenses I have used in this video. I would like to clarify a few things and offer an update on this review.
Here is a link to find the first cheaper lens used in this video: http://www.ebay.com/sch/i.html?_nkw=0.45+550d&_sacat=0&_odkw=0.45+lens+550d&_sop=15&_osacat=0
Here is the second: http://www.ebay.com/sch/i.html?_trksid=p5197.m570.l1313&_nkw=58mm+0.45X+Wide+Angle+Lens+82mm+Front+Threads+for+Canon+High+Quality+Lens&_sacat=0
BUT!!! I have realised a few things after having used these two lenses for a while (and after reading a few helpful comments).
1: The more expensive lens suffers more from chromatic aberration (Google it) than the cheaper lens.
2: I think the only reason the expensive lens does not have vignetting is that it is simply not as wide as the cheaper lens. (wanna see for yourself? open my video in two tabs, pause the first video when the cheap adapter is on [2:58] and pause the other when the expensive lens is on [4:38]. compare)
So in hindsight, I would now actually recommend going for the cheap lens and simply zooming a little on the lens itself or in post production.