I've adjusted the rangefinder on my GSN. With the camera mounted on a solid tripod, focus on a distant point and adjust the infinity setting first--both horizontal and vertical. Then measure off one meter accurately and adjust the one-meter setting second. Make small, gradual turns in the adjusting screw until you get a feel for the changes it makes, because a little turning can make a big difference in the focus.
On the GSN, the one-meter adjustment is made not with a screwdriver but with a 5.5mm wrench on the linkage under the front edge of the rangefinder.
Last edited by nparsons13 : 12-12-2011 at 19:54.