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A pro photographer based in my city (lives around the corner) swears by that Tamron 18-270mm. However, if it's truly not as good as a kit lens (which are notoriously unsatisfactory) then perhaps your Tamron really is a duffer. But Keith's advice is sound and maybe the Sigma or Canon lenses may be better. It may be worth spending a little money on getting the Tamron checked before you spend more money, though, and there are ways to do a DIY focus test (if your camera has the ability to 'fine-tune' its focusing).
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