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Originally Posted by Nikonfreak
How does it do? I have the Nikon 1.7X and it doesn't degrade the image much at all. It's very, very good.
Lots of folks use the Kenko ones. I'd be curious to hear about what folks think about third party brands.
I know I used the Sigma 2.0X before when I had the Sigma 70-200 and it was "acceptable" but not "excellent".
Julio
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I can't really say much about the Tamron 1.7X, because I almost always shoot with my manual focus lenses, and my only reasonably long AF telephoto in Nikon mount is a Vivitar 70-210 Series one (late AF version, which is not that great). With my manual focus lenses
I use the Kiron MC7 2X quite a bit with my 300mm f2.8 and 180mm f2.8 Nikkor ED lenses , and I am happy with it. The Kiron is an optical copy of the Nikon TC-201. After comparing the Kiron and the TC-201, I sold my Nikon TC-201 because I felt that their performance was indistinguishable. So, while I own the Tamron 1.7x TC, it's really something I bought because it cost me under $30 on ebay, and I pretty much have never used it on any lens good enough to tell how it performs.