03-07-2013, 11:54 AM
Quote:Considering that you own the 180, I would still buy the 70-200 f4, assuming that you have an FF camera. I agree very much with the arguments brought forward by the previous participant and personally I am in the process of buying a 70-200 f4 for my D700, instead of a f2.8. The better VR, lower weight and size make it a better lens for me. Now, if you own a DX body, I would sincerely consider the Tamron 70-300 VC. It is equal to the Nikon from 70-200 and better from 200-300. I used it a lot on a D300s and loved the sharpness even at 300mm, (450 mm focal range). To achieve that with a FF, you need the converter, which does not work with the 70-300, so....................!!You only reach 200 x 1.4 = 280mm with an 1.4x TC. That is about the same as the Tamron on its own.
A 2x TC will lose AF unless your camera can AF with an f8 lens, and a 2x TC will have a bigger impact on resolution.
If you do not care about good AF, you can also put a Kenko 1.4x TC on the Tamron.