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from NY, NY on 6/22/2010
Comments about TAMRON 1.4x SP AF Pro Teleconverter for Nikon:
Using with nikon d5000, tamron 70-300. Result is effective 630mm. Pictures are sharp and in some cases stunning. However, autofocusing is not reliable. 50% of the time it takes a long time to focus (goes long, and short multiple times) or does not focus. Would buy again and would recommend with noted caveats.
from St. Louis on 5/20/2009
Comments about TAMRON 1.4x SP AF Pro Teleconverter for Nikon:
Works good for what it is. That is, a way to 'cheat' and get more range out of a lens. I used it at a major league baseball game with a Tamron 70-200 f/2.8 lens on a D300, and got some really great shots. It didn't seam to slow down the autofocus much, and since the sun was out, and I used a fast lens I had plenty of light to work with. There were a few times when the lens didn't want to cooperate with the camera through the converter, but a bit of wiggling seemed to do the trick. I would have prefered the Nikon version, but it won't work with the Tamron lens. (the Nikon converter sticks out to far on the front) But for the money it does a good job, and brings things in a bit closer with only 1 stop of lost light.