Conclusión: Bought this from Amazon. Everything looked good when arrived, no crushed box and great packing. Put it on my 5d mark11 and went out to try it out. About the third photo the AF would do nothing, no movement at all. I messed around with the AF settings and turned the focus ring and it started AF again. It happened again on the next putting and now on the third it is in the box ready for return. No matter what I did it was stuck. Even tried it on my 50d with no luck.
Conclusión: Repeatedly the salesperson tried to reset my camera settings for all Auto. I explained I shoot in Manual Mode and preset the camera for each shoot. After clearing most Custom Settings, he handed the camera to me in frustration. After using this new purchase, I understand his frustration. There is little-to-no control in Manual focus mode. Each shoot requires an exposure/focus lock-up or the lens slips out of focus.