There's a lot of nonsense in this thread about f/11 and 800mm being absurd. Like others here, I've been shooting f/8 and 800mm successfully for several years with a 2xTC on a 400mm DO II, even stopping down to f/11. So, I could find a use for it. Some admit it would be OK for static bird life but not birds in flight. But, have they tried doing BIF with any 800mm lens? It's darned difficult with that narrow field of view and I prefer 400mm on FF or 560 at the most to give me a chance of tracking and keeping in frame. The Sony mob are using the 200-600m f/6.3 with a 2xTC and not complaining about the f/13 aperture.
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