nikon 70-200VR / all those buttons

a simple, yet unanswered question!

there are 3 raised, equally spaced buttons, just in front of the focus ring.

what are these for? what do they do? does anyone use them?

i hope someone knows

marc

 

it's a very good lens, thanks for your help


m

 

Those are focus lock buttons. Press any one to lock focus.

 

being ignorant, why do you need focus lock buttons?
is that for manual focus or af?

thanks