<p>I wish to thank all the responders for your thoughtful answers to my questions.<br>
Looking at the full picture of the bird I think I have exaggerated the difficulty of focusing with the Nikon camera. This assuming that the AF spot is small enough for covering the bird's head, comparing with the 5N focus peaking scintillation on the eye. <br>
However I will wait until Nikon shall provide focus peaking and magnification in the viewfinder features on top of the current DX features. Or I will purchase a Commlite Nikon-Sony adapter.<br>
A word about my considerations for using the AF-S 80-200 2.8 ED on Sony: probably better than Sony's, lower priced used, being one the best zooms, the cropped image quality will equate same size images taken with longer zooms. There's the option of adding Nikkor teleconverters. Heavy, but then I am using a mono- or tripod for birding anyway. Finally, I will have the option to purchase a Nikon camera :-)<br>
Thank you all again.<br>
Shimon</p>
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