Different focus setting (1 Viewer)

[gerald762]

I have a Sigma 150-600, on a Nikon D7200. I am very pleased with it. There 3 settings on the lens for focusing at different distances, Full or 10m-infinity or 2.8m - 10m. As the lens focuses very quickly what is the advantage and main use of these settings?

 

[nikonmike]

The main use is to stop any risk of the lens wasting time trying to focus in areas you don't want it to, for birds i mainly used the 10m to infinity, insects flowers etc the 2.8 to 10mt