This is a large crop as the subject was far. Cloned out some of the branches that were a little distracting.
Purpose is to see the sharpness with the new tc. Shutter speed kept low on purpose
Nikon D3
Nikon 500mm vr F4 w/ 2x tc III @ 1000mm
F9
1/640
ISO 400
Aperture Priority
Tripod mounted
Difficult to evaluate the sharpness with such a large crop, any little thing is magnified big time !!! As presented would give the bird lots more room al around, maybe getting 70-75% of frame only !