60D portrait shot by Sigma 70-300 mm lens
I bought a 18-55mm bundled kit of Canon EOS 60D camera. I needed a zoom and macro with my limited budget so i went for Sigma 70-300 macro. The results of some of the lens are very poor but at the same time sometimes very fine. If I change it to Canon 70-250mm or similar type of lens, like 18-270, what will be difference in the quality of output? Kindly suggest. Thanks.
Here are few pictures from the Sigma lens:
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