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Sigma 15mm f2.8 EX Diagonal Fisheye

15mm_Lg_1_
Review Date: May 8, 2006 Recommend? yes | Price paid: Not Indicated | Rating: 10 

Pros: Sharp at 2.8, really tack-tack sharp when you close it down a bit. Hardly any CA (less then my 17-40 F/4L) and _very_ contrasty (almost keeps up with the 17-40 + pola..) Build is good, focusring could be better damped though. The Canon-counterpart could not beat this in a mile.
Cons:
Exposed frontelement, but it's a fish, so that's natural. AF is not really fast, but it is spot-on and it doesn't need to focus a lot (+1m most extreme setting)

I mainly use it for indoor oversights during party's and occasionally for landscape uses, and man this thing is sharp as hell. When you close it down to F/8 it is just unbelievable. Also the contrast is just stunning, it can almost keep up with my 17-40 F/4L + Hoya Pro1 pola...

 
Canon EF 17-40mm f/4L USM

ef17-40_4l_1_
Review Date: Oct 19, 2005 Recommend? yes | Price paid: Not Indicated | Rating: 10 

Pros: Sharpness even wide-open, AF-speed is simply awesome. One of the fastest focussing lenses there is and build-quality is just next to perfect.
Cons:
Some CA on some shots, but nothing to worry about. Yes it's F/4 but that's what you pay for.

I had the 18-55 kit, and this is just such a relief. It's damned fast with autofocussing, it's sharp even wideopen in the corners. On some shots there is some CA visible, but nothing to worry about in my regard.

If you're looking for a really decent wide-angle zoom, this is the one. It outperforms the Tamron 17-35, Sigma 20-40 and Sigma 17-35 by a long shot. Yes it does cost 200,- more, but that's worth it!