lol, that is full frame actually, no cropping done at all, and i quite like the tight focus, not that i can change that without moving the telescope mount around (it weighs somewhere in the order of 30kg) not hard to do, just a hassle and more often than not, scares the birds away.
i like the way the birds are haphazardly positioned in the first pic as it adds a bit of character to the shot and draws you into their world. if you've spent time observing birds you know how mischievious and hilarious they can act. i quite like it myself, but each to their own... that being said, i wish i had a bit more room between the right-hand bird and the edge of frame, and i would have liked the tail feathers of the bird i front to have been in frame.
in the second shot, i would agree with your assessment. but i love the expression in the birds eye.
as for lighting...natural light, most likely done in direct sunlight of an afternoon. i can't quite remember the full details of the shot.
and like i was saying in my moon thread...some of these telescope give the 'L' series of lens' a run for their money, at a good 1/3 the price, though the aperture isn;t as good as an 'L' and it is manual focus, but image quality...
unbelievable...
and thanks