Quote Originally Posted by Lamar View Post
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
That post is dated 2006 and is just about certainly based on the frame and scan rates of the no-longer-in-use-for-broadcast NTSC 3.58 system. Unless you used an old TV (CRT not flatscreen) with an NTSC signal, the results won't be accurate for estimating shutter speeds. The new system may still show valid info for relative speeds of the curtains though. Leitz used a similar method before TV - http://www.skgrimes.com/library/old-...shutter-tester

By "rear curtain" do you mean the first/opening or second/closing curtain? They are not always in the same relative fore-and-aft positions on all cameras.
If you really want fun get a Kiev - metal slats running up and down!