You know [USER=4411]@David Stallard[/USER] , I have been checking again the Tamron 150-600 G2 and now I'm seriously considering, the main reason is that I already own the Tamron Docking Station and this lens is "real" weather sealed. According to the videos that I have checked from people that I trust, the AF is not worse than the one in the Sigma 150-600 C.
I still want to see more on this lens, but thank you for mentioning!
