Yeah, I just make one experienced add on this. I have to say that I was one day (yesterday also) shooting and quite a bit actually. With DFA*70-200 + HD TC1.4 and it has some problems to get from shortest focus distance up to infinity/past 2 meters. I suppose that it is because of that TC. As well as it does a bit decrade image quality, but that was expected. If i don't count that MFD-Infinity thing, which I can help just turning focus ring to get it to 'see' what is at there, it is actually very fast. i was chasing dragonflies(managed to follow some and camer actually did follow quite well. Not much to show thou...but i did scare a hare on move and just lifted the camera up and did manage get couple pictures before it went in bushes. What is great is that it was in shadow, there was a lot of branches and what not. It did manage to spot that hare through all that, instantly. Similar thing happened with dragonflies, When I managed to get those suckers in focus or in finder all in all, they were in focus, mostly. AND this is with 'slow focusing' DFA*70-200 + 1.4HDTC.
it seems more or less that it does focus and it does it fast, I have to say that I'm lusting after 55-300 PLM and I don't have any money...but just to see what this thing can do with appropriate lens. All in all I think that I'm quite amazed still and can't help of thinkin that this camera will enable more and more of those 'onetime in life time(which would not be true since there would be more than one)shots. There are many other things coming up my mind too...but I think that there arre even more pleasant things coming up. BTW I did use auto AF for this, as A-21 was/is better in other things. Now I'm beginning to find out which mode to use for which things and I have USER 1-4 reserved with different styles. Going to finetune couple of them with Sf functions(Very handy feature btw.) and cut it to be just 2, and doing the same to get optimum 'portrait' and 'macro' and landscape USER slot. Will save a slot for VIDEO too, as I'v played a round with that also.
Anyway, here is the picture.