Gene51 wrote:
Most birders I know will handhold that lens. You'll find that any tripod mounted lens can be a pain as you try and move around the pivot point as the bird flies all around.
That being said, the Nest Gimbal - seems to get a lot of buzz - though I have not seen any independent reviews or comparisons on it yet, nor have I had one in my hands to evaluate.
Just get in touch with Carter @ The Camera Cottage. He can fix you up in no time. There is only one independent review that counts, your own!