Archived posting to the Leica Users Group, 2008/04/20

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Subject: [Leica] Noctilux DOF Film vs M8
From: pklein at (Peter Klein)
Date: Sun Apr 20 20:12:03 2008

I will be very interested in your results, Steve.  I have followed that 
whole "back focus solution" thread on L-camera-forum.  The way I see it, 
it's not one issue.  It's a complex interaction of several issues, and that 
makes the problem very confusing.  Some people have had great luck with the 
"Allen wrench fix." Others have "fixed" one lens, only to have others go 
out.   Others have played ring-around-the rosy with the focusing, going 
through multiple tries and tweaks, and never quite getting everything right.

On a $5000 camera, we "shouldn't" have to deal with this ourselves.  We 
"should" be able to send our lenses to Leica, and they should all work on 
the M8 at all stops. The first time.  We should be able to get our body and 
our lenses calibrated to an absolute standard, and everything should be 
just right.  But this doesn't appear to be reality, at least not right now.

I think you are correct that all other things being equal, if you got the 
most critical of your lenses right with the RF cam adjustment, the rest of 
your lenses should fall into place.  So IF your Noctilux is in within specs 
at f/1, and so are your other lenses, then tweaking the RF so it jibes with 
the wide-open Noct should be within tolerances for the rest of your 
lenses.  With the possible exception of 90mm lenses, which may be more 
critical than the Noctilux.


At 03:41 PM 4/20/2008 -0700, you wrote:
>On Apr 20, 2008, at 8:29 AM, Tina Manley wrote:
> > At 09:46 AM 4/20/2008, you wrote:
> >> In every case the DOF shifts away from the camera with the M8. In
> >> other words the lens appears to back focus. T
> >>
> >> Len
> >
> > There is a long thread on how to fix back focusing on the M8 on the
> > Leica Forum:
> >
> > 
> >
> >
> >
> > I'm going to try this with the Allen wrench as soon as I can get
> > around to it!
>I just adjusted my M8 based on their discussion.  It was easy enough,
>I didn't break the camera, and it focusses on the mark,  at 6-10 feet
>with the Noctilux at f1...
>so far so good,
>more later,

Replies: Reply from red735i at (Frank Filippone) ([Leica] Noctilux DOF Film vs M8)