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Sigma 8-16mm F4.5-5.6 DC HSM

Review Date: Aug 25, 2010 Recommend? yes | Price paid: $699.00 | Rating: 9 

Pros: Very sharp, relatively small and light, handles flare well, chromatic aberrations are essentially a non-issue, build quality
Unable to use filters and distortion due to extreme angle of view

I purchased this lens for a European trip for use on a Canon 7D. I was very pleased with the results I obtained. My copy is extremely sharp across the frame at all apertures and focal lengths. It is great fun to use due to its amazingly wide angle of view and it handles very well. Additionally, it auto focused accurately and quickly. The color and contrast are very nice and it handles flare quite well. Obviously, distortion is an issue with such wide angles but even this is relatively tame by 12mm. Also, Lightroom 3 does a very nice job with it's lens correction feature here. The only true negatives are the inability to use filters and one must be careful with the somewhat exposed front element.
I think Sigma hit a home run with this lens. There isn't anything like it for a crop sensor.

Canon EF 100-400mm f/4.5-5.6L IS USM

Review Date: Mar 31, 2008 Recommend? yes | Price paid: $1,210.00 | Rating: 10 

Pros: Very versatile, great build, surprisingly fast focus and excellent IQ.
Early generation IS.

I bought this lens new in December. It has become my favorite lens. It has great range and the image quality is surprisingly good. It compares favorably with my 70-200f/L is. It focuses quickly and accurately in good light and even in marginal light the focus speed is reasonably fast. It is also built like a tank.
This is a terrific lens that has numerous uses. Highly recommended.

Canon EF-S 17-85mm f4-5.6 IS USM

Review Date: Aug 8, 2006 Recommend? yes | Price paid: $500.00 | Rating: 9 

Pros: Excellent range, very sharp and of course, IS.
Distortion at wide end but correctable with software.

Despite some mixed reviews, this lens provides surprisingly good results especially at the long end. It focuses very quickly with nice color and contrast. The IS is amazing and the range is very useful. Overall, this is an excellent walk around lens.