Archived posting to the Leica Users Group, 2007/03/19

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Subject: [Leica] Focus, Noctilux, M8, C Mode & Scotch
From: hoppyman at (G Hopkinson)
Date: Mon Mar 19 15:13:28 2007
References: <> <>

George that puts the cat amongst the pigeons! I shall track that user forum 
reference down. Certainly the author of the focus test
that I've used was recommending it for DSLRs not rangefinders. (I was 
testing the Summilux asph on M7)
If the 45 degree ruler test is invalid, it seems we need an alternative. I 
can only think of moving a test target incrementally and
shooting a frame at each position. My first thought might be a perpendicular 
target along a flat bench with gradations. This might
help reduce the variables by eliminating tripods and angles. Anyone that's 
had success or has suggestions could chime in here.

Concurrent with this, I can follow how the roller adjustment works in the 
camera body, however the effect at different distances and
with different lenses (and their different cams) is a consideration. 
Empirically, it's apparently worked well for those LUG folk
that have tried. It would be trivial to mark a zero point so that you could 
reverse your adjustment, I guess. 


-----Original Message-----
[] On Behalf Of
Lottermoser George
Sent: Tuesday, 20 March 2007 01:08
To: Leica Users Group
Subject: Re: [Leica] Focus, Noctilux, M8, C Mode & Scotch

Over on the Leica Camera User a Leica rep responded to this "ruler  
test" with some insight. Because the range finder windows are off  
axis from the lens the test is really quite useless for rangefinder  
cameras. One really has to check the focus with the film plane and  
the subject plane at absolute parallel - as that is the only time  
that the rangefinder  and subject will actually work. Makes perfect  
sense. When you consider this while testing; results become very  
different. It quite altered my way of testing and working with the M  
in the last few weeks.

George Lottermoser

On Mar 17, 2007, at 2:54 PM, Robert Rose wrote:

> If I try shooting at a ruler, at the closest focus around 3.5 feet,  
> the focus seems to be maybe 0.5 to 1.0 inches beyond the focus I  
> set.  (Of course, when hand holding I am probably swaying more than  
> that.)  With the shallow DOF at f/1, this is enough to put an eye  
> out of focus.

Leica Users Group.
See for more information

Replies: Reply from imagist3 at (Lottermoser George) ([Leica] Focus, Noctilux, M8, C Mode & Scotch)
In reply to: Message from robert.rose at (Robert Rose) ([Leica] Focus, Noctilux, M8, C Mode & Scotch)
Message from imagist3 at (Lottermoser George) ([Leica] Focus, Noctilux, M8, C Mode & Scotch)