Originally posted by Dartmoor Dave The guide that I linked to in a hurry earlier makes it seem more complicated than it actually is in your case, as you wouldn't need to do all that taping film to the back of the camera stuff with two SLRs, since the focusing screens are at the same distance as the film plane. Just set the cameras face-to-face with the lenses both set to infinity, then look through the viewfinder of the camera with the known good focusing screen and look at the focusing screen of the camera that needs adjusting. Re-shim until the markings on the focusing screen of the camera to be adjusted are in focus when viewed through the known good camera.
Oh, darn. I'm doing a terrible job of explaining this. It's such a ridiculously simple thing when you know what it is, but it's really hard to explain it to someone who's never done it.
As someone who hasn't done it my interpretation is basically.
- Use known good camera to reach a specific focus point
- Shim misaligned camera until the focus points match and achieve a matching clarity between both camera's viewfinders.
- Celebrate!