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| p.1 #6 · Temperamental 500mm f/4 IS II lens with 2xIII? |
Db, that is interesting, but I can't really help.
I seldom do anything f/8, and even when I do, it is strictly on static targets, because my tolerance for "creeping" AF is very low. Similar to 800L, but worse, f/8 combos allow successful AF hit only when you are prefocused closely, or you are photographing a big/slow/high contrast bird which allows enough time for lens swings and creep, FTM focusing correction and similar screwing around.
As far as 400 II + 2xTC III is concerned, that has always worked reasonably well for me, no exception, thus I am not hesitant to use that one.
I like those shots you got at 1000mm, the egrets are really nice, and theat car-moron's background is very fine.
I also suspect you'd have a higher success rate (consistency) with the 500 II + 1.4xTC III combo, from the standpoint of the capture rate/performance as well as IQ.
Petkal a.k.a. Supertelemaster
Those are all points that I agree with. And thanks for the comments.
The success rate of the 500 II + 2x TC III was surprisingly good on the second day of shooting which I hope is typical for the setup, and in accordance with its MTF characteristics. The tracking, as you said, was easy for slow birds like Egrets and Pelicans and wasn't too bad at all for the somewhat more speedy Cormorants that tend not to be too erratic. I had a few keepers with some Terns which are much more difficult to track. 1000mm, even on a FF camera, is a lot of focal length with which to keep the bird in view and I hope to get better at it.
I did have to work the focus limiter switch a few times during the couple of hours of shooting that I had.
Yes, the 500 II + 1.4x TC combo was easier all around, but having the option to capture the bird at twice the size is nice too.
And the maximum aperture of 400 II + 2x TC combo is still a large 5.6 so that performs really well.
I'm really liking these super teles so far - and also uncovering and developing some super tele muscles to adapt to them.