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i agree with wave01 if you want a budget zoom thats has very good image quality for the price go with the canon 55 - 250 iv'e heard a lot of good things about this lens
i can't comment on the sigma 70 - 300mm os lens but i can comment on the sigma 70 - 300mm apo dg macro variation which is fine to 200mm then softens off quite dramatically
on the other hand if you are willing to go second hand for not much more than the new price of the sigma 70 = 300mm OS variation you can pick up a canon 70 - 200mm F4 L ( non is ) which beats all of the lenses mentioned hands down and to gain that extra reach you could always get a canon 1.4x teleconverter in the future and still have better image quality
if the choice was mine today it would be a second hand canon 70 - 200mm F4 L no question
iv'e been down the sigma and cheaper canon route and they pale in comparison owning in the past the sigma 70 - 300mm apo dg macro and a canon 70 - 210mm F4 macro
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