Sigma AF 15mm f/2.8 EX DG Diagonal Fisheye

Excellent full frame fisheye for full frame cameras... This thing is razor sharp. Lower apertures give some vignetting, but that can easily be corrected via lens profiles in Photoshop. In fact, most of the distortion can be removed as well. I was hoping this would serve as a good substitute for a super wide angle lens, and I was correct. Distortion can get to be a bit much towards the outer edges, and correction does snip some from both sides of the image, but it's a great compromise for the price and quality of this lens. Nothing but great things to say about Sigma lenses in general. I will definitely purchase others.

Great lens cheap accessories.. The lens itself is a great lens but the accessory kit is cheap junk that was falling apart as I pulled some of it out of the box.. DO NOT WASTE THE EXTRA MONEY FOR THIS BUNDLE. Just get the lens by itself and save yourself some money. a

Sigma 15mm F/2.8 EX non-DG for Canon For the relatively low cost and the rare application, this puppy does more than the job. Images are sharp for most of the shots. Wide open at F/2.8, center is already very sharp with great corners. Stepped down to above F/4 or more, and you'll be amazed that something with a 180 degree view can have such good all around sharpness. Some users might say that at 15mm, a large aperture isn't quite necessary. I think it's an added bonus since not only can you shoot at a lowly 1/15th of a second (the usual hand held rough guideline), you get F/2.8. The only gripe I have with this lens is, like many users, the funky hood and the slow focusing. The lining in the hood deteriorates with time and makes the cup of a hood hard to use. (I removed the gummy lining and squashed the barrle part of the hood into a slight oval shape so it holds onto the lens by a bit of pressure). As for focusing, it is on the slow side, bt shooting landscapes and anything relatively far won't be a problem because of the focal length. All in all, it doesn't quite matter how great or disappointing this lens is since in all honesty, there aren't that many choices when it comes to AF fisheyes out there anyways... but hey, this one happens to be a good one, even beating the Canon counterpart in many reviews. Try it out and sell it off after you're tired of the fishy effects.... this puppy retains its value ;)