Have I bought the lens because I'm tired of constantly wearing two lenses and then constantly changing. That I will lose at the picture quality was clear. But if you, this lens from Tamron 18-270mm with the F / 3.5-6.3 Di II VC LD ASL IF Macro Lens for Canon compares then they are worlds apart. The Canon lens is much faster, more precise, quieter and just better quality. Although the Canon lens has less zoom and even in some tests was the lower grades it is for me still winning, so the Tamron goes back again. And in my opinion, the objective of Tamron has a design flaw because the can not zoom, if you want to photograph what down from above. If there is someone on the speed and quality is such a special emphasis on how a slightly larger zoom, then you should buy the aforementioned Tamron. Or possibly try with the SIGMA 18-200mm 3.5-6.3 DC OS lens for Canon stabilized, or Sigma 18-250 / 3.5-6.3 DC OS HSM Lens for Canon.
