I have today received my 350 Tele-Tessar FE and notice that the little "screw" on the lens mount is turned to the red dot, meaning I can't mount the lens.
This is probably a silly question, but I would like to know if it is safe to just turn that screw back using a screwdriver or such or if I need to do something else to make the lens mountable.
I have today received my 350 Tele-Tessar FE and notice that the little "screw" on the lens mount is turned to the red dot, meaning I can't mount the lens.