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Sigma 12-24mm f4.5-5.6 EX DG Aspherical HSM

l3a_copy
Review Date: Jul 9, 2005 Recommend? yes | Price paid: Not Indicated | Rating: 7 

 
Pros: sturdy, well built, good contrast, fun to use, crisp at the center
Cons:
the bulging front lens, so that you cannot use filters; clever but quite unpractical solution for the lens cap; low image quality at the edges

This lens is "different", extreme, quite like using a fisheye; you have to accept its limitations, but then it's real fun. Image quality with a 1.6 crop factor is good, except at the edges at 12mm. Used it for hard work for one year, and it withstood very well any kind of punishment, including rain and dust. I only changed it to switch to the Canon 10-22, but really recommend it.

 
Sigma 24-135mm f/2.8-4.5 Aspherical IF

sigma24_135
Review Date: Jul 9, 2005 Recommend? yes | Price paid: Not Indicated | Rating: 8 

 
Pros: very compact, good image quality, very versatile, good handling, solid built
Cons:
slow focus compared to HSM or Ultrasonic lenses

I bought it as a replacement for Canon lenses, but I got caught. This lens is a pleasure to use, with a 1.6 crop (on a 20D) image quality is decent wide open and very good stopped down (already good at 5.6). The zoom ring is a little stiff and the autofocus a little slow (it hunts), but overall it is a very usable lens.