Archived posting to the Leica Users Group, 2010/02/24

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Subject: [Leica] how to test focus
From: kkanno at users.symmetric.net (Ken)
Date: Wed, 24 Feb 2010 11:24:12 -0600 (CST)
References: <C7A9E2B6.2C8EE%chris@chriscrawfordphoto.com>


On Tue, 23 Feb 2010, Chris Crawford wrote:

> What is adjusted depends on what is off. The lens could be off or the body
> could be off, or they could both be wrong! Also, the lens has two things to
> adjust, the accuracy of the cam that pushes against the RF follower in the
> body, and the shimming of the optics to correct focus. The body has three
> things that can be off: The distance between the lensmount and the film
> plane, the infinity setting of the rangefinder, and the close-distance
> setting of the rangefinder!

Interesting. I didn't know there were so many places adjustments could be 
made. I think I'm just going to cut and grind a piece of glass and see 
what it shows. It will be easier than waiting for film to come back.

The m7 seems to have parallax correction, but does anybody know how far 
off the rangerfinder box can be off from the center of a lense 
itself, or is this always lined up correctly on a 35 or 50mm lense?



Replies: Reply from hopsternew at gmail.com (Geoff Hopkinson) ([Leica] how to test focus)
In reply to: Message from chris at chriscrawfordphoto.com (Chris Crawford) ([Leica] how to test focus)