I just found out I have a big problem with this Lens, It will not AF or Manual Focus in certain positions as in, if I'm at Infinity and re-focus closer at a angle of 45* or greater from the Horizon, the Lens has a hard time focusing and sometimes not at all, will not even hunt. It doesn't even matter what AF mode I'm in. In manual mode, The Lens will stop and start moving randomly no matter how fast or slow I'm turning the Focusing ring.
Same thing when pointing down wards, but just the opposite, Close up to focusing further away, same problem. But here is the Kicker. Close up to Infinity point above the Horizon, it's ok in both AF and MF, same pointed down but just the opposite. Pretty much Horizontal, the AF Focus studders till it locks, same in MF.
I bought the Lens in Aug of 2013. I have a feeling it's going to cost me a lot of money to get it repaired. I have a nasty feeling it was like this when I bought it because I didn't have a lot of keepers and I thought it was me. Has anyone had this problem? How much is the average repair for this Lens?
Edit to add, it does this with both 60D and 6D...............