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Rating: 
Summary: Big bang for the buck
Review: 15 years of photography experience here... The Sigma 15mm fisheye has been extensively reviewed and compared by other websites (go ahead and search) and this is a very good product. The canon has a tighter focus and a *touch* faster in focusing, but with the massive depth of field with this lens, it's not a problem at all.
Be aware that if you use this on a 1.6 crop factor digital SLR that has APS sensors like my 20D or digital rebel, then the fisheye effect is not as pronounced on film or 1.3 or full frame digital SLRs.
Watch lens flare should direct sunlight hit it also...but that happens to any lens that has protruding or bulbous lenses.
This is a much better bang for the buck lens than the canon equivalent which costs significantly more. If you search around, you can find much lower prices on this lens.
Rating:
Summary: wahoo!!...
Review: i am a fisheye lens addict. i have had this lens for a few months now, and i use it for almost everything. the lens was worth every bit i payed for it. and the sigma customer service was so fast and easy. the lens takes clear sharp pictures everytime. this lens takes the best skateboarding and band pictures! if you are considering this lens, i would definately reccomend it. i love how the pictures can either be circular or full frame. its a great investment.......
Rating:
Summary: wahoo!!...
Review: i am a fisheye lens addict. i have had this lens for a few months now, and i use it for almost everything. the lens was worth every bit i payed for it. and the sigma customer service was so fast and easy. the lens takes clear sharp pictures everytime. this lens takes the best skateboarding and band pictures! if you are considering this lens, i would definately reccomend it. i love how the pictures can either be circular or full frame. its a great investment.......
Rating: 
Summary: Worst Experience Ever
Review: I wanted to use this lens with my Canon EOS-10D and I was shocked with its performance. The AF only works for objects closer than 4 feet and it does not focus on objects farther than that. First, Sigma told me that the serial number I bought was old and the lens needed updating for it to work with Canon digital SLR Cameras. I have no idea why they distribute outdated lenses to their resellers.. That's not all, I tried manual focus, and the photos came out very soft even at very small apertures (large f-stop number)After 4 weeks I get the lens back from Sigma in the same condition. I can only call this horrible service and a very bad product. My recommendation is pay a little extra and either go for the Canon EF 15mm f/2.8 fisheye or the Canon EF 17-40mm f/4 (which I did).
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