Sigma 10mm f2_8 fisheyeThe Sigma fisheye is a great lens to have some fun with. It’s relatively light weight and compact and it produces images that are edge-to-edge sharp, but not quite crisp. Unfortunately, mounted on a Canon camera it doesn’t offer the 180 degree fisheye capability it would on a Nikon due to the extra crop factor of Canon cameras, but 167 degrees is close enough.

…I did find that when shooting landscapes with this lens, the integral hood, which is definitely necessary to avoid glare on the lens when shooting outdoors does unfortunately produce a circular vignette around the frame. The vignette is not completely round – it does flatten at the top and bottom edges, so it is necessary to crop photos further in photoshop to produce perfectly round vignettes. Being a fish-eye the lens is not capable of accepting front-fitted filters. Instead, there is a gelatin holder at the rear. Personally I would fear image quality degradation from gelatin filters, and given the difficulty of supply of such products it’s probably best to leave it out. Still, it’s a fun lens to use and unless you can shoot panoramic shots, there’s nothing that will capture the expanse of a truly wide shot like a fish-eye.