Ji Li wrote:
Thanks for the note of the Sigma 14-24. It looks impressive, but of course, we will only know for sure after it is released and used for a bit.
Meanwhile, the Tamrom does have 15x focal length, and vibration control, but is noticed for loss of clarity when wide open, especially away from the center of focus. Nikkor is quite a bit more expensive.
The Tamron is actually sharper than the Nikon from a couple of tests I have seen. The difference in any case is small.