I found an interesting post over at Rangefinder Forums regarding checking relative shutter curtain speed. Such a simple procedure to a seemingly diffcult problem. It shows how to use a CRT to check/adjust tension on your shutter curtain springs to ensure they travel at the same speed. I have checked mine and the results were consistent with what I was seeing in the pictures from each on my Zorkis. I have now adjusted according to the post. The next roll will tell.....

http://www.rangefinderforum.com/foru...ad.php?t=30343