Archived posting to the Leica Users Group, 2008/12/22

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Subject: [Leica] Coding the Noctilux?
From: kenlass at gate.net (Ken Lassiter)
Date: Mon Dec 22 05:23:36 2008
 
Thanks, Geoff, for your advice.  I have to shoot more with the Nocti to 
see if I have any problems with back focus on the M8.  When I use it on 
the film Leicas, I usually shoot wide open or nearly so.  I have the 
habit of bracketing focus for close subjects by shooting several shots 
and shifting my head and the camera back a little and then forward a 
little. Often, one frame is noticibly sharper on the main subject.

Happy Holidays!  ...Ken

Ken the focus shift would be likely to occur at apertures larger than f/8. 
If the lens is correct wide open it will occur as you stop down but not be 
apparent at f/8 for example because the DoF will mask the error. Use it wide 
open and it will be fine if you are good enough! Stop down a little and 
you'll need to adjust . But a little experimentaion should give you the 
correction to make it work. Or trade it on the new Nocti if you are Bill 
Gates, or the Summilux 50 ASPH.
Cheers
Geoff