I am very often out in the woods or down by the shore and I often come across a good variety of birds. I have a Tamrom 70-300 macro zoom which is okay, but not "great." The sharpness level compared to some of the other bird pics on here would be a 7 and not a 10. For feathers, eyes, beak detail, that's simply not acceptable.
So, what is the best lens for this type of shooting. I am shooting a Nikon D7000. I even find that the kit 28-105 while not a "bad" lens, it's not the best either in terms of crisp sharpness. I have heard the Tokina lenses are the best after-market but not even sure on that and am thinking I might get into the same boat as I am with the Tamron.
Oh, and also, it is best to have a fixed telephoto, or a zoom telephoto?