I currently have on order a Canon 18-55 IS, 50mm ƒ1.8, and am thinking about extension tubes for macro... In terms of IQ, would it be a good move to ditch all three of these in favour of a Sigma 18-50mm ƒ2.8 EX? am I right in thinking the sigma would be better for standard walkabout than the 18-55 canon, better for macro than using tubes but not as good for low light as the nifty... Is that the head and tail of it?
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