Thanks useful information: 
I will be looking at one when they are released. We are off to Africa again next year & the 5Dmkiii with 100-400 just isn't enough some times. The extra crop of 1.6 makes the lens 640mm. The option is A a bigger lens $$$$. B crop the photo & lose quality. C 7Dmkii. D either a 1.4 or 2 x converter.
Depending on cost, the 1.4 or 2x will save some $$ but then I lose low light capability with either converter.
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