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Sigma 120-300mm f2.8 EX DG HSM

Review Date: Mar 25, 2008 Recommend? no | Price paid: Not Indicated | Rating: 4 

Pros: Can't think of any
Don't like the coating on the lens Stiff focus ring Back focused on the 1DII

I found the lens over priced and had back focus issues
and the coating on the body was inferior to Canon's

Tamron 28-75MM F/2.8 XR Di LD Aspherical (IF)

Review Date: Mar 2, 2008 Recommend? yes | Price paid: $339.00 | Rating: 10 

Pros: Small, Light, Sharper then Canon, Less expensive
Not really. but just a bit more mm on both ends would be nice

I've had Tamron in the past when I did film and trust there lenses.

After switching to Canon I had both the Canon 24-70 and 24-105 and the Tamron 28-75 beats them both with first hand real world test I performed on them all.

Color is equal, contrast from the tammy was better, sharpness, the Tamron won by just a bit.

AF from the Tamron is just a hair under the speed of the Canon's and is accurate in low light.

The Tamron was a bit soft wide open @ 2.8 but any smaller it was killer sharp.

If you need weather sealing and IS then you know your choices.

But if your after IQ the Tamron 28-75mm is King and well built too.

The newer generation of lenses in the world of 3rd party are now equal or surpass Canon.

I'm very much a Canon red ring, L nut but this Tamron 28-75 stands out as a winner for Tamron similar to the Cinderella story.