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very sharp images at 10mm right up to 20mm extreamly sharp at f5 and above.
I was very impressed by the speed and quality of focusing even though wide open it is only f4 compared with the canon f3.5... for the price it is a very useable piece of glass that seems to be attached to to my 20D most of the time...
the very silly lens cap when used with the hood could be improved and then it would score a perfect 10.
all in all the best super wide lens at twice the price.........
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