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Canon EF 70-200mm f/4L USM

Review Date: Sep 9, 2006 Recommend? no | Price paid: $560.00 | Rating: 1 

Pros: Light weight comparing with f 2.8; good optics; good color rendition.
Consistant back-focus on 20D; white color to be conspicuous;

I bought this lens + 20d and 17-40mm for my trip to Hawaii last year. As I came back home checking out the photos, I found almost 75% of photos taken by 70-200mm f4 are out of focus to some degree, while almost all photos taken by 17-40mm are nice and sharp. After reading some posts at dpreview, I figured the 70-200m f4 often back-focus on 20d. I sent the lens and body back to Canon New Jersey factory to calibrate. And It came back unchanged. I was totally frustrated with Canon's servise. I bought a Canon 70-300mm IS f4-5.6 lately, it performs way over my expectation. Focus is alway dead on, at 200mm f5 it generates super sharp images. So if you are making decision between the 70-200 f4 and 70-300 IS, I'd say go with the black one.

Sigma 24-60mm f2.8 EX DG Lens

Review Date: Jan 6, 2006 Recommend? yes | Price paid: $290.00 | Rating: 10 

Pros: small, light, great optic, well built, very good AF, great color rendition.
f2.8 is not as sharp, but usable, zoom creeps, no MF overide.

The AF is not as fast as Canon, sometimes you need to try a few time to get a accurate focus. zoom ring is not as smooth as canon either. for the price, nothing to complain.