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Sigma 20mm f/1.8 EX DG Aspherical RF

Review Date: Mar 8, 2005 Recommend? yes | Price paid: $400.00 | Rating: 5 

Pros: Sharp
Won't focus consistently even in moderately low-light on my 10D and 20D.

This is a sharp lens - if you can get it to focus. I don't know whether it's a compatibility problem or just the crappy autofocus that Canon uses in it's 10D and 20D, but in anything other than bright light, this lens will not focus consistently. I can have 10 shots in a row in focus and then 10 out or 1 in and 1 out. (And that's with stationary subjects. I have tried to use this lens to back up my formals at weddings, but half of the shots are useless.)

Sigma 15mm f2.8 EX Diagonal Fisheye

Review Date: Jun 9, 2004 Recommend? yes | Price paid: $379.00 | Rating: 6 

Pros: Solidly built. Very sharp (if you can focus it).
Very slow when moving focus from near to far. Can only use via zone focus on my two 10Ds.

I've used this for several weddings now. I love the angle of view it gives me on my 10D and the fisheye effect on my EOS3. However, I noticed many of my pictures were very blurry even though I was using decent shutter speeds and one-shot autofocus mode. Did some test shots and found it would not focus consistently on my 10Ds (two). Seems to focus a bit better on my EOS3.

Sent it back for repair: returned with note saying "focus adjusted" - same problem.

Sent it back again. Sent me a new lens. Same problem.

Verdict: unusable on my 10Ds except with zone focusing (since it's also impossible to accurately focus it manually). I now use it for close-in action shots at the reception, so I just set it to 1m and get good shots, even at 2.8.

It is an incredibly sharp lens. It's just too bad you can't focus it!