Archived posting to the Leica Users Group, 2002/05/05

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Subject: Re: [Leica] Linearity adjustment on M3
From: "dante@umich.edu" <dante@umich.edu>
Date: Sun, 05 May 2002 19:43:49 -0400

The specific problem is that the camera seems to line up at infinity (focus
and RF) but at close distances focuses behind the subject (as in a few feet
behind).  

The only thing I have been able to surmise is that either

(a) the lens (a 50mm Nikon lens) is not collimated or otherwise is now other
than 51.6mm FL (I did notice that the front group was screwed in a little
past where the selected aperture matched -- probably the work of that damn
Canon ND filter); or

(b) the rate of change in the RF mechanism is somehow wrong.

While I would love to believe the problem is (a) (I unscrewed and reseated
the front group), it had no apparent effect when I did a crude comparison of
the film-plane focus and the RF (now when the RF says on at 6 feet, you have
to turn the lens a little more toward infinity to get the film plane to
focus).  Also, the problem manifested itself with a Leica 35/2 as well.
Neither lens presented a problem on my Hexar RF.

???

I just sent it all out to be fixed today, so I guess I'll find out.

Dante


> What do you mean by linearity? Linearity of what?
> 
> John Collier
> 
> On Sunday, May 5, 2002, at 08:34 AM, dante@umich.edu wrote:
> 
>> 
>> Is it inside the top cover, or is it in the shutter box (with the
>> infinity
>> adjustment)?  I am trying to gauge how expensive it will be to have it
>> fixed.
> 
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Dante Stella
http://www.dantestella.com

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