Thanks both 🙂
Paul F, i didnt know about the lens issue, am going to get a new lens at the same time. Looking at a Sigma 50-500 so have to check which it fits.
GliderSpit, thanks for the info. I mainly do airshow and ice hockey with my camera so is good to hear about the 7ds iso noise. Does the auto focus impact much on aircraft pictures would you say?
Will