cjc2 wrote:
IMHO the DOCK is one of the things that make the SIGMA much better. Just the idea of being able to update lens firmware without a round trip ride to service is a key for me. And yet the dock can do so much more. I don't believe that it will work with the 50-500 though. I don't have the older lens, but I do have the 150-600 Sport. Don't expect it to be as good as something like a Nikon 400/2.8, 500/f4 or 600/f4, but, for the money, it is a darned good lens! Best of luck.
Thanks for the response. I am thinking of selling the 50-500 which, of course, does not work with the dock and buying the 150-600 Contemporary. The Sport is too expensive for what I actually do. I am looking for real world experience with the dock. I know it is only $50 but I would buy it only if it lives up to the claims.