09-30-2015, 07:18 PM
The Sigma 17-50mm f2.8 DC OS HSM is a better lens than the Tamron 17-50mm f2.8 Di II VC, better in build quality, better optics and better auto focus. f2.8 gives you some ability for more shallow DOF than the same focal length range on the 18-135mm IS STM, and the 18-135mm of course a bigger focal range. A choice you have to make yourself.
Best ultra wide angle option: Canon EF-S 10-18mm f4.5-5.6 IS STM. Very affordable.
Best ultra wide angle option: Canon EF-S 10-18mm f4.5-5.6 IS STM. Very affordable.