so Im in the market for a walkaround-travel-portrait lens for my t3i, and im pretty locked on the simga's art (50 or 35mm), but im afraid that I will get a copy with front/back foucsing.
i don't want to spend money on sigma's dock, and I don't want to haslle with that either.
so my questions are:
1. what are the chance of getting a bad focusing lens from sigma's art series?
2. Does front/back focusing considered a malfunctioning lens? or is it just something that can't be changed?
3. If I am getting a lens with a focus problem, will I be a ble to return it to the store, and get a new one/money back?