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Sigma 18-50mm F2.8 EX DC

Review Date: Nov 23, 2005 Recommend? yes | Price paid: $450.00 | Rating: 6 

Pros: Sharp and contrasty, solid build quality, excellent focal length on a APS sensor body.
Poor low light focus, doesn't play well with Canon flash.

I found the Sigma 18-50 sharp an contrasty at all apertures as long as there was enough light to focus. Once the light got dim enough to use the flash, however, the Sigma had a very difficult time focusing. I was constantly battling out of focus images when I had to use the flash in dark rooms. The final straw for me was when I bought a Canon 550EX flash (I had been using a Sigma EF500 DG Super). The results from the Canon flash and the Sigma lens were horrid. The flash was perfect with all of my other (OEM) lenses. I finally sold the Sigma and purchased a Canon 17-40L. The 17-40 is fantastic.