Originally posted by Dwight Schr-ute
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Which 5D? If you have the 5D mark IV, it can autofocus at f/8 at all points. The 5D mark III can autofocus at f/8 at the center point. Previous 5D will not autofocus at f/8 at all.
Return the 2X II if possible, it costs 2 stops f/5.6 --> f/11, no Canon DSLR focuses at f/11 except the new mirrorless bodies.
If you have a 5D III or IV, pick up the 1.4x III which costs 1 stop, it will turn your 400 mm f/5.6 into a 560mm f/8.
Bird photography in the wild is expensive. Cheapest entry (with Canon branded gear) is 80D + 100-400mm mk II + 1.4X, and that's still not long enough for many situations.
































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