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

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Review Date: Dec 14, 2004 Recommend? yes | Price paid: $699.00 | Rating: 8 

 
Pros: Ultra Wide Angle for Crop or Full size Cameras, barely no Distortion, built very solid, HSM, sharp, nice Contrast
Cons:
Vignetting when Hood is attached @ 18+ mm, Rear filter Design - Front Filter only 82mm (expensive!) with lens hood (vignetting >18mm)

When you're using a crop Camera (in my case a 20D) a 24-70 lens is no langer wide angle, so I had the choice of 17-40L, EF-S 10-22 and the Sigma 12-24.
The 17-40L would have given me just 7mm over my 24-70L. The 10-22 is EF-S so I would'nt be able to use it with a full size SLR or DSLR.
I've had a Sigma Lens before (24-70 2.8 DF DG) and it was not what you would call a perfect Experience: Soft @2.8, Slow AF.
F4.5-5.6 is not the real deal (f4.5 only available @12mm), but the lens is quite nice. IMO the Filter Design is pure Crap and the only Reason for the 4/5, otherwise it would have been 5/5