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Canon EF 70-200mm f/4L USM

ef70_200_4_1_
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.
Cons:
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

24-60mm
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.
Cons:
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.