Archived posting to the Leica Users Group, 1998/07/08
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]><< Find the correct port for adjusting the > horizontal rangefinder alignment, and turn it with a screwdriver until the > images are perfectly superimposed. >> > >Mark, could you describe how this done? > >Tom Shea Sure Tom, Once you find the port giving access to the horizontal adjustment screw (again, I don't know where it is on a Leica because I don't have one), you will find that you can get a good small screwdriver in there onto that adjustment screw. You will know whether or not you have found the right screw by watching the image in the rangefinder patch while turning the screw a little bit. If turning the screw causes the image to move as if the focus of the lens was being moved, then you've got the horizontal adjustment screw engaged. Now, put your camera on a tripod. Aim it out the window. Turn off your room lights. Aim the middle of the patch at a very distant object. (A few miles or more is preferable.) The object should be small and very contrasty. Like I said before, a star is good. A small specular reflection on the horizon might be good. A sharp edged, contrasty vertical line would be best. Then, set your lens at infinity focus. (To get this perfect, you need to be sure that the lens is really focused so that your contrasty distant object is really in focus at the film plane. For very distant objects, this is the same as infinity.) Now, without adjusting your focus, turn the adjustment screw until the viewfinder image of your subject is exactly superimposed on the rangefinder patch image of your subject. Then, you are done with the horizontal rangefinder adjustment. The vertical adjustment is pretty much the same idea. - -Mark Walberg