Bronica AEIII
 

I just bought a ETRSi and AEIII finder. I am trying to figure out how
to get the meter to work. The film speed is obvious. When the dial on
the right is set to either A or M, does this mean the meter is on?
Is there some sort of display in the finder? What do the M and C
buttons do on the top of the meter?

Thanks in advance.
Dan Stanger