That is a really nice pic, Steve, nicely showing how well that 800/11 performs. And is that frost or just a hairy plant? I look out the window and all I see is wall-to-wall greyness. Such is november here...
The 800/11 is indeed terrific for songbirds. I have my back-button set-up with Eye-AF and Spot-AF on the AF-ON and Star button resp. and then I have Zone-AF on the DOF Preview button. With these tiny birds I start with Spot-AF and then switch to Eye-AF and that works very well.
My problem at times was actually finding the birds in the viewfinder, because of the narrow depth of field you have. I got lost a few times. I'm sure that would improve with more practice. It's just getting used to shooting with 800mm.
A more serious problem that I ran into is tree clutter. Because of the ability to shoot birds from further away, there's also more clutter in the way. Like so, with this Jay (I only did a quick edit here; it was not meant to go on display). I took one shot, moved an inch and he was gone - Jays are seriously skittish birds...

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forum: Canon Digital Cameras
Quite a good shot!
(about the bold text above) The same happens when looking through a riflescope. In this case one has to open the left eye to find the subject, then close the left eye and switch to the right eye on the viewfinder. I still struggle with it 








