200-500mm + TC14E III

Started 3 months ago | Discussions thread
mrfau New Member • Posts: 14
Re: 200-500mm + TC14E III

I use a D850 with the 200-500mm for bird photography.  It's not just the cropping capability but also what I call micro-focus capability.  I use single-point focus and the focus point looks smaller in FX mode than DX mode.   My rule of thumb is whenever the bird is smaller than the box, AF is sketchy.   I can usually get better AF performance in FX mode than DX mode.

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