Sigma have recently announced a 150-500mm f/5-6.3 which includes all the usual goodies like APO and HSM, but also interestingly has OS, which is sigma's version of a anti-vibration/image-stabilizing system. Its a real shame they didn't update the 50-500 with OS though
I bought this lens a couple of years ago for an Africa trip with my D60, I got some good results but it is heavy and I now use the canon 100 - 400 is, but have kept the sigma for the extra reach
Similar price, try the Sigma 100-300mm f/4... with a 1.4* TC, you get a 420mm f/5.6 lens, still faster, and a lot sharper than the 170-500mm at the long end.
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