Be patient dear friends, I know that probabily this is not the correct forum for this question but it is driving me crazy and I do not have the guts for the nikon mailing list... I bought this 105mm micro nikkor manual focus AIS and it has a silver knob at one side. I turn it to the right and to the left and nothing happens. Some good soul could answer me what in the hell is that $#*&*% knob for???
