Looking back, I would clearly agree with that. Currently I only use the 1.4xIII extender with my 600mm. However, if I had full AF functionality at f8, I would use the 2xIII a lot more, provided the tracking is acceptable. So, the more I think about this, the more tempting it gets.neuroanatomist said:Personally, I really find only the full AF at f/8 to be a tempting feature, and given that I only rarely use an f/8 combo the upgrade isn't sounding worthwhile for me.
The next important thing is high ISO noise and DR performance. To justify the expense, I would like to see some improvements here. And, considering the time that has past since the 1DX was released, I am pretty confident we will see that.
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