Great Fisheye if you cannot afford the Canon lens. Excellent lens.
R. Ray, Amazon
9 March 2015
Summary: I was actually skeptical that a 15mm Fisheye lens could offer much more than my current 16-35 Canon L series lens. I have to say that I was really impressed. The fisheye aspect to the lens allows it to capture so much more of the scene (nearly 180 degrees).
Excerpt: Lens is sharp stopped down a couple of stops, but edge and corners are definitely soft wide open. Unsuitable for night sky photography as star points on frame edges and corners are fuzzy, indicating coma; an expensive lesson to learn.
Pros: Lightweight, Strong Construction, Very compact
Excerpt: Pleased with the quality of this lens. I use it on a Canon 5DIII, and really like the look I get. Sharpness and color rendition are very good. I only backed off one star due to sometimes it is slow to focus or seems to hunt a little, but the type of photos you take with a lens like this that's...
Excerpt: Good performance. I usually purchase Nikon glass but chose this lens to go with an Aquatica Underwater Housing due to smaller size and therefore smaller port size for the housing. Took it for a test shoot today. Happy with it.