Hello,
I have tried to ask a question I have put to myself since a long time:
what was the register used by Fed before WW2? Was it regular? Were the S-s regulated to the Leica 28,8mm, to make the changing of lenses easy, or not? So, I have checked around 100 of my cameras, with a simple caliper (2/100th mm) measuring the register at about 10h30, with always the same gesture.
The results in thelseves are not really interesting. I have neglected the thickness of the film, the filmplate, whose position can be uneven due to bad springs, etc. But the comparison of the results is interesting, I think.
During all the prewar period, there is no regularity. The results generally vary of one to five (!!) tens of a millimeter for cameras which seem in original condition. And there are differences which can reach up to 1mm, but these cameras are doubtful as for their original state. Note that the difference is always under 28,8mm, never above.
The two prewar S I have used regularly since I have them are both correct at 28,8mm... Only chance! And the regular NKVD I used too at 28,7mm, without problems for photos, so correctly shimmed.
For postwar cameras, same irregular results up to the end of the first 1f series (release button, speeds Z-1/20th..., s/n c. 300000). At the apparition of the 1f second series (bowled button, speeds B-1/25th), it's the miracle. Everybody is between 28,8 and 28,9mm (my measures). So, a normalisation in 1951/52, much later than what I thought.
I did the same with the Zorkis 1 I have: I have found a regular 28,8/28,9mm from my Fed-Zorki 1949. My other Feds and Zorkis are correctly regulated. All my Leicas too, including a 1930 (C) at 28,8mm too.
Nothing as a conclusion. But certainly, what a mess it was to regulate correctly a S with its four lenses...
Jacques.
05/06/2016 08:49
