« on: December 11, 2011, 11:33:56 AM »
Here's the best way to summarize this situation:
When shooting events, I usually use two bodies, a 5D MkII and a Rebel T3, and two lenses, a 24L MkII and a 135L. I swap the lenses back and forth between the bodies as needed.
The 135L consistently focuses correctly on both bodies.
The 24L only consistently focuses correctly on the 5D MkII; on the T3, it usually ends of focusing too close, by as much as a foot or two.
This issue comes into play most when in poor lighting (even using the flash), but it seems to happen at all subject distances.
I'm pretty sure something needs to be calibrated by Canon (everything's under warranty), but I'm not sure what. Any help?