Interesting info Orrie! Thank You.
orrie smith wrote:
I prefer the Nikon 200-500. I had the tamron 150-600, but sold it because it took too long to gain focus, it would constantly hunt, and was noisy, the Nikon focuses quickly and I have not yet noticed it hunting for focus, plus it is quiet. you may also use a teleconverter with the Nikon, not the tamron. the 14 III will auto focus, the 1.7 you need to manually focus. I know nothing about the sigma, but many posts on this site recommend the sport over the contempory.