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Sigma 20mm f/1.8 EX DG Aspherical RF

20_f1_8_1_
Review Date: Mar 8, 2005 Recommend? yes | Price paid: $400.00 | Rating: 5 

 
Pros: Sharp
Cons:
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

15mm_Lg_1_
Review Date: Jun 9, 2004 Recommend? yes | Price paid: $379.00 | Rating: 6 

 
Pros: Solidly built. Very sharp (if you can focus it).
Cons:
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!