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Sigma 10-20mm F4-5.6 EX DC HSM

111_small
Review Date: Jan 5, 2006 Recommend? yes | Price paid: Not Indicated | Rating: 9 

 
Pros: Build quality, Optical quality and price
Cons:
None so far

I've owned this lens for about 4 months now. I'm very pleased with the results. Matches my 17-40L in quality when stoped down a couple of stops. After I'd bought it, I saw an in depth test report for the lens, head to head with the Canon 10 - 20mm, complete with MTF charts, the reviewers opion was, that optically there was little to choose between them, the Canon lens has a bigger maximum aperture, so is slightly faster. But the Sigma is half the price. (Amateur Photographer Magazine December 2005 UK)

 
Sigma 135-400 MM f/4.5-5.6 ASP AF APO

18499135-400
Review Date: Apr 27, 2005 Recommend? yes | Price paid: Not Indicated | Rating: 9 

 
Pros: Cheap compared to others with this focal range, well built, sharp
Cons:
Lens creep, but not really a problem when shooting.

This lens has been around some time now. It seems to perform a lot better than its 2.6 MTF rating on Photodo would sugest. Perhaps they
got a not so good sample. I use it with a Canon 20D and are very pleased with the results, used on tripod or beanbag, mirror lock helps as well if the subject is static. Lots of samples on:
http://www.pbase.com/cameras/sigma/135-400_45-56_aspherical
And mainly good reviews on:
http://reviews.iwon.com/pscPhotographyReview/Sigma/PRD_83589_3128crx.aspx#reviews