I managed to pick up a D600 recently,and I am looking at a tele lens. Looking at the 300MM to 500MM range,preferably with a built-in focusing montor,and probably going to get a lens secondhand(below £500). I have narrowed it down to a few choices:
1.)Sigma 50-500MM
2.)Sigma 150-500MM
3.)Sigma 120-400MM
4.)Sigma 100-300MM/F4(probably will get the 1.4X TC at a later date).
Anybody have experience of the lenses - wanting mostly to take pictures of aircraft with them. Any alternatives??