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Hi, we're talking about the newest, Sports, version in combination with the D750. Before purchasing the Sigma, I owned the first generation Tamron 150-600mm. I sold it, to help fund the Sigma... I found that I used the Tamron mainly at the long end and that long end required quite some...

@Bikerbrent: 4 meters yes, I do however wish I had the eyesight to spot a sparrow land 4 miles away :) @Ironwood: it is the Sigma TC, but not the most current TC-2001 version, but one before that. The APO DG 2xTC. Here's the link to that one I'm using...

I saw some folks (@Ironwood) here call for comparisons and tests with the Sigma 120-300...so I obliged :) So I recently acquired a new to me Sigma 120-300 f2.8 Sport lens. The lens feels and handles great and is a joy to use. Be sure though to upgrade to the latest FW. If it stays on the 1.00...

@Ironwood: what I mean is that the current FW version for the lens is 1.03 and I bought a used one that was never updated so it remained at 1.00. The lens was slow to focus, OS was very intermittent (sometimes working, most of the time not working). After I updated the lens to the new FW using...

I have the older DG version of this TC. The difference being that my version doesn't report the correct focal length and aperture to the body. Anyhow...here is the comparison I made using my Tamron 70-200 f2.8 VC USD with and without the TC. Here is the link to the full image in case the...