I had a look at the original manual:
-) you first, at larger manification, adjust the helical mount (bearing the lens)
-) then, at lower magnification, you adjust the cam (near the parallelogram joint)
In other words:
-) in the first step (10x magn.) you focus with the focussing ring and then set the clamp on the focussing ring in the prescribed position, without moving the focussing ring.
-) in the second step (2.5 magn.) you unlock the cam and then focus by turning the adjuster screw behind the cam.
At the side of the cam is the locking screw, behind the cam is the adjuster screw, running alongside the parallelogram arm.
Last edited by AgX; 03-02-2013 at 07:51 PM. Click to view previous post history.