Thu 24-Jan-13 01:26 AM | edited Thu 24-Jan-13 01:29 AM by dm1dave
This can be an expensive question. So, not knowing how big the bank is...
The sigma zooms are a pretty good option and the price is good. The 150-500 will give you nice reach and very good image quality. The downside is the small max aperture at the long end – it can be harder to keep your shutter speed up.
The Nikon 300/f4 with a TC14E is usually a highly recommended lens in this forum. Image quality is outstanding. It could be a bit short on an FX body but should work quite well with the TC17E.
If you could spend more – the Sigma 120-300/f2.8 with the Sigma 1.4TC is an outstanding lens. You can save some money by looking for the older non OS version. It is a bit difficult to handhold. The newer OS version should be better for handholding. This is a very good alternative to the Nikon 200-400 at about half the price.