Thanks again for the helpful information and the great tutorial. I suspected that you were able to get fairly close. This is an example of one from the weekend - I am trying to decide if 600mm would provide the framing I like (I borrowed a 400mm and added a 1.4x for this shot - 560mm). The camera was probably about 12ft from the bird - and I still felt it needed to be cropped.
This is the version with cropping and minor LR and NIK adjustments.
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