I didn't read through the thread, so this may have been discussed. Have any of you noticed that this lens is more susceptible to the effects of heat shimmer than some of your other lenses? I was got some deer shots today in the Bighorns at a distance of about 20 yards early in the morning. Back of the camera looked fine. But when I got them home and looked a little closer, there was quite a bit of squiggly going on. I was a little shocked given the air temp was in the low to mid 20s, the distance was relatively short and the shot was over grass.
Just curious. Glad to have this one back in the fold and look forward to pairing it with my 50D when the 7d2 has the 500 on it.