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Sigma 18-125mm F3.5-5.6 DC

Review Date: Apr 29, 2005 Recommend? yes | Price paid: $239.00 | Rating: 7 

Pros: cost, zoom range
unreliable auto-focus (particularly at infinity)

I bought this lens to replace the Canon kit lens (18-55mm) for my new Canon Rebel XT (which by the way has a decent review in the May 2005 issue of Popular Photography). The first copy of the Sigma 18-125mm lens I had wouldn't focus past 15 feet. I exchanged it. The focus on the copy I have now is inconsistant. The problem is for distances greater than about 15-20 feet but especially when shooting at infinity. It is sometimes front focusing. This isn't necessarily a problem if you are shooting at 18mm up to 24mm if you consider the hyperfocal distance which is about 10 feet at f/8 when shooting at 18mm and 17 feet at f/8 when shooting at 24mm. No problem if the autofocus winds up at 15 feet instead of infinity (maybe even better for your shot). However at longer focal lengths this is a problem (of course you can focus manually but the lens should work properly). Since I can't exchange anymore I will have to send it back to Sigma. From what I read in an earlier review here I might not get it fixed. I should add that I called Sigma about the first copy I had before I exchanged it and they said that "most auto-focusing problems are the fault of the camera sensor- not the lens". This lens is reviewed in the February 2005 issue of Pop Photography. The conclusion is "A good DSLR zoom for the money." No mention of the focusing problems that have been mentioned in these reviews a few times. For you Canon users with the 18-55mm kit lens the Popular Photograhy conclusion:"Go take high-quality pictures and forget the rest."