Quote:
Originally Posted by Itsed65
The 400 2.8 is aimed at sports sideline shooters. They are normally too big and heavy to use for BIF. Sony really needs a 500 f4 for their system, but I haven't read anything about one in development. I also use the Sony 100-400 with very good results, and with the 1.4 TC you get a 560mm f8 lens, which works very well.
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IME, there's almost no drawback to using the FE 1.4x teleconverter on either the a8 or a7RIII, with the FE 100-400mm GM attached. Subbing the 2.0x for the 1.4x on the a7RIII yields some stunning results, but then fails to AF precisely in situations where the 1.4x has no issues at all. With the 2.0x, you've got 200-800mm, at good resolution, but you're at f/11!!! It works surprisingly well, but not near the keeper rate for BIF. Still, in good light, the results can be stunning:
Hummer Enjoy Currant Nectar by
David Stephens, on Flickr
Note that DOF is really shallow, even at f/11, because I'm pretty near this hummer. Look at the flowers for focus.
For static subjects, the AF works very, very well, with a keeper rate near 100% at f/11.
As for the expected 400/f2.8, I'll need to see how heavy it is. I may just stay with my EF 500/f4. AF isn't ideal with the Canon lens, but it's the right weight and works very well as a 700mm, with the 1.4x TC-III attached.