I'm curious to know what is everyone's favorite lens for wildlife photography – with birds in particular.
And why is that lens your favorite, is it mm's, sharpness, max f-stop, low weight, compactness, unobtrusive, etc..
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Right now I am rather limited, the lens I use more for wildlife/birds is a PENTAX-A* 300mm f4 MF-only with a PENTAX *ist D. I also use about equally a Panasonic FZ7K, it's long AF/MF tele zoom really helps. But the FZ7K yields awful results at ISO 200+.