Last year I got this lens to replace a Nikon 80-400mm. For birding the 80-400 was not a good choice, too slow (focusing) and did not work well in low light. The Sigma 150-500 is a better lens in many aspects but the Nikon (was) is a better lens regarding the general quality of the pictures. I need to do a lot of work using Photoshop CS4 to improve the sharpness and color quality of the pictures that I take with the Sigma 150-500 lens. I also have a Nikon 400 (F 2.8) that I use for birding photography and (of course) is a superior lens in all aspects. But you need a sturdy tripod and if you have to move around for birding, then the Sigma is a acceptable choice for hand held camera shooting of birds. Most of the time I use the Sigma 150-500 with a Nikon D300 and a monopod (for support) and the results are OK, sometimes good.
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