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Sigma 20mm f/1.8 EX DG Aspherical RF

20_f1_8_1_
Review Date: Oct 5, 2008 Recommend? yes | Price paid: Not Indicated | Rating: 9 

 
Pros: Sharp, cheap, has variety of uses, works fine on 5D
Cons:
Can be noisey, Sigma Clutch System

One of my favourite lenses, works great on both 20D and 5D. Extremely sharp at F4 and above. I prefer the results from this lens for landscapes above my 17-40 L.

In low light situations without flash it is OK but not great, but gets acceptable results .... and can get shots otherwise you would not get with other lenses.

F1.8 to F2.8 - OK, F2.8 to F4 - Pretty Good, F4 + Very Good.

The Sigma Clutch System is a pest, and it can be pretty noisey if hunting for focus.

All in all, for the money I am not complaining, and highly recommend.