<p>Hi Folks.</p>
<p>I was not sure if this was the correct forum in which to post, but it does involve my Nikon gear, so here it goes. Since I do bird photography and sports photography I am looking for a nice long lens that won't totally break the bank. I've been reading the reviews on the Tamron 150-600mm lens to use with both my D3 and my D7100 and the specs and results I've seen are pretty impressive. When I was at the photo expo in NYC last month, I got to see both lenses and notice that the Sigma had 2 different vibration compensation modes, one that is similar to Tamron and one that is "optimized" for panning shots where the horizontal VC remains engaged but not the vertical (that is what I understood, anyway). This intrigued me since you frequently pan when birding. Does it make sense to wait and see how the Sigma (contemporary model, not sport model) performs when it gets released or is the Tamron lens just as good? Any thoughts appreciated.</p>
<p>Thanks,<br>
Rick</p>