#10. "RE: DX vs. FX" In response to In response to 4 Mon 07-Jan-13 05:53 PM by jamesvoortman
Durban, ZA
I don't think the D800 is at fault here. It looks like the camera has focused on the branches in front of your subject. Difficult shot with the branches and light background.
Using a converter on your 300 f2.8 may well hobble it a bit. There will be some loss of quality with any converter, some more than others.
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