Excerpt: So I work a lot and photography is my tool for reminding I'm a much more interesting person outside of my work. I was a paid photographer at one point, maybe I might do it professionally in future. So I was interested in this lens since I could finally get this effect on my smaller sensor camera.
Pros: Consistent Output, Durable, Fast / accurate auto-focus, Rugged, Strong Construction
Summary: I picked this one out for my Sony Alpha 77 from all the other options, because this one has autofocus. I take a lot of self portraits and I needed autofocus for that purpose. It is exactly what I expected, works well in low light, sufficiently sharp, and fun to use.
Summary: A nice, ultra wide angle lens. The HSM focus drive is fast and quiet. One great added feature is the adapter for the lens cap. It has 72mm threads, so unlike most ultra wide angle lenses this lens can be fitted with a protective filter, which is very important for valuable lens optics.
Summary: This product is great except cost. If you don't mind spending around $900 then this lense is for you!!!! If you are budget minded you could get a manual lense far cheaper that produces the same great pics. The only reason for 4 stars is cost everything else is wonderful.
Excerpt: Focusing can be done on objects that are only mm away. This leads to my biggest concern when using this lens: the danger of hitting the object that i'm focusing on, resulting in a scratched front optic.
Pros: A really wide angle lens, Easy To Use
Cons: Can't use a filter, Easy to bump optics, See a barrel in photos
Excerpt: I wanted a full round fisheye for my Canon 7D, and this is the only one I could find. It seems well made and I'm content with it, though there were issues. Specifically, the 7D was unable to get correct autofocus.
Pros: Easily Mounted, Firm Mount, Full round fisheye, Strong Construction, Very wide field
Summary: Combined with Nodal Ninja rotating tripod heads, I'm using this lens to produce equirectangular 360deg x 180deg panoramas. Six shots in 60deg increments work perfectly when stitched with Hugin or AutoPano.