Well I picked up a Sigma 18-35mm today
I tried two in Park Cameras and both seemed to back focus (one a lot more than the other) so I bought the best one. With the micro adjust on my 70d as far as it goes it's almost about right but perhaps still slightly short so I guess I'll buy the USB dock rather than return it and hope they can find a better one.
Love the lens so far
My first lens faster than F2.8 so it's nice having that option and having it on a wide zoom is even better 

I tried two in Park Cameras and both seemed to back focus (one a lot more than the other) so I bought the best one. With the micro adjust on my 70d as far as it goes it's almost about right but perhaps still slightly short so I guess I'll buy the USB dock rather than return it and hope they can find a better one.
Love the lens so far

