Archived posting to the Leica Users Group, 2000/08/09

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Subject: Re: [Leica] Heliar vignetting help ...
From: John Collier <>
Date: Wed, 09 Aug 2000 19:32:51 -0600

I believe there were two solutions offered. One was to make a thin paper
gasket (would only work if the lens screws on slightly too far) between the
lens mount and the adapter. The other was the unscrew the mount and rotate
to a more auspicious set of screw holes. Lightly mark the present mount/lens
body relationship before removing the mount. I think I recall the poster
saying adjustments of around 4 degree increments were possible.

John Collier

> From: "David Freedman" <>
> I recall seeing this subject addressed recently when I wasn't particularly
> interested and now that I am, I can't seem to locate the messages in the LUG
> archive. Hence this plea for help.
> I recently purchased a Heliar and the first few rolls are showing what looks
> to be pronounced vignetting in the lower left hand corner.  As I recall from
> the earlier LUG messages, one possible "fix" for this is to rotate the mount
> on the lens so that it lines up properly when screwed into the L-M adapter.
> I do not have the Voigtlander L-M adapter (Bowers I think) and the lens is
> indeed skewed by several degrees when screwed in.
> Before I start loosening screws on the mount I was hoping that someone with
> a better memory or filing system would kindly forward the relevant
> information.