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Sigma 15mm f2.8 EX Diagonal Fisheye

Review Date: Jan 12, 2004 Recommend? yes | Price paid: $314.00 | Rating: 10 

Pros: Superb optics
AF gets confused

Optically this lens is a champ. I am no optics engineer, perhaps designing a fisheye isn't that hard after all... because this one simply in another league with similar rectangular lenses I've tried: not only it's f2.8 (being relatively compact), but it's tack-sharp @2.8! Even flare isn't much of a problem. Colors, contrast, sharpness - everything is great.

However at such wide angle 10D's autofocus gets confused. Actually this lens can't AF on anything beyond 2-3 meters. But with such huge DOF I usually just set it somewere between 1m and infinity, and everything is in focus, even at f2.8.

Also I noticed that my 10D tends to overexposure about one stop with this lens. Not sure if it's a wide angle issue. I haven't used anything wider than 17mm rectangular, so I can't be sure.

Canon EF 35mm f/2

Review Date: Jan 12, 2004 Recommend? yes | Price paid: $220.00 | Rating: 10 

Pros: Excellent optical quality Affordable price
Lack of USM

I 100% agree with previous reviewer. People who give a lens rating 3 of 5 just because it does not have USM keep amazing me. Guys, are you focusing or taking pictures??? ;-) This lens is simply superb, it's excellent even wide open at f2.0. Colors, contrast and overall picture appearance are world-class. And you get all that for about $200 these days.

If some give it a rating of 3, let them name their favorite 5-rated f2.0 lens for $200 which is better.