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I'm still playing with the AFS lenses and FT1 adapter but so far here are my thoughts on the focus speed. It's really fast in searching, practically as fast as my D3 trying to search for the focus. Now that's just trying to search for the correct focus - finding it is another story. Out in the daylight I was trying to shoot some birds in flight with my 300mm f/4 afs and it was definitely hit or miss. In dim light, with a number of afs lenses, it would sometimes search through the focal ranges but then give up. I'm talking really dim light and I compared it to the D3 with the same settings and the D3 would sometimes lock on, other times continually search.
The main thing I noticed is that the V1 will search once through the focal lengths and then stop trying if it misses. I definitely think this is just a firmware fix as Nikon could have easily added in all the focus features found in the V1 lenses (ie: multi focus points, full on auto focus, continuously try to find the focus if it misses once); but the fact that they didn't means they don't want to cannibalize sales of their dslrs. Who knows, maybe they will add it in the future. I was really impressed with the V1-lenses ability to lock onto a focus point and it would follow it on screen... something like that would be awesome with birds in flight with the FT1 adapter but alas it's not to be (as of now anyways).
So overall, it's a mixed bag. With good lighting it'll focus on fine. Past a certain focal length it starts searching more and missing, which is more apparent on slower focusing AFS lenses like the 300mm f/4 afs. When the weather improves I'm going to go out again with more lenses as I primarily tried just the 300 f/4 but it could be a lot better with the faster focusing 80-200 afs that I have. Curious to hear what others have experienced.
-- At the end of the day, when dealing with birds in flight you give up focus accuracy to gain a ton more reach. Further tests to come =)
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