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Hi Guys, just wanted to clarify, my issue with the lens isn't BIF's, it's the fact that AI servo doesn't work at all when focused on something mid distance, say about 20 meters, then you go to focus on something in the far distance. If you try to focus on something nearer, it's fine. This is only happens when in the 375-600 range. Lower than that and it'll focus in servo from 3 meters or whatnot to infinity. Take a look at my Flickr stream, last 3 are with this lens. The kestrel is slightly out due , I think,...Show more →
You notice this occurrence at long FLs because of the large defocus range at those FLs. The lens can't find a focal point and just stops looking. I'm assuming you have focus search enabled in camera- is this correct? Did you try to "bump the focus" along, or did you just hold down the AF button? Does the lens exhibit the same refusal to find focus if you switch to one-shot AF?