Wich telephoto lens to choose?

[Kayaker72]

Andre,

If the reviews of the 400 DO II come in as expected (exceptional), then, for me, it gets down to what you value more: the ability to get 800 mm f/8 or 300 mm f/2.8. Because the are both going to give exceptional performance at ~400-420 f/4 and 560-600 f/5.6. The 400 DO may have a slight advantage in that range as it would be native or with a 1.4xTC vs 1.4xTC and 2xTC. We'll see. That is one of the things I'll be looking for in reviews. Again, assuming everything checks out in reviews.

For wildlife, I suspect the 400 DO may be better. And the 500 or 600 f/4 even better.