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I find the suplied Canon lens is okay at 50mm or so but at 18mm edge sharpness falls off consiferably.
I have a Sigma 28 to 300mm ( a huge zoom range) that performs poorly at 28mm, but at 300MM is quite good, though the Autofocus doesnt handle action well, (I took it to a Newcastle Knights game and it struggled with the players against the green grass to get accurate focus). Apart from that it performs well as a telephoto lens, and zoomed in is almost as compact as the supplied Canon kit lens and fits nicely into my camera bag while attached to the camera.
Scott
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