Archived posting to the Leica Users Group, 2000/03/24

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Subject: RE: [Leica] M6 Wide Angle Body = reduced vf magnification?
From: Skip Williams <skipwilliams@pobox.com>
Date: Fri, 24 Mar 2000 08:50:20 -0500

OK, OK, now I'm in over my head.  I have just enough knowledge to be 
dangerous.

Why do you have to change the profile on the focusing cam when you put on 
the spectacles?

Skip

At 3/24/00 01:14 PM  +0000, you wrote:
>Skip,
>I understand perfectly about that modification, short of modifying the
>profile on the focusing cam on the lens (as the bespectacled 35mm /M3 lenses
>were) there is no way to maintain correct rangefinder focusing with a pair
>of goggles on the front of the lens. Ask Reinhold Mueller, the engineer who
>did these mods (on 2 or more lenses) for Tom, he'll tell ya!
>
>Now Tom would say that there's little need for rangefinder focusing with a
>21mm lens, and he'd be right, if that's what suits him. For myself, although
>I was most interested in having this mod. done, I forwent it as I figured
>I'd be one step forward and two steps back.
>
>Each to his own,
>
>best regards,
>Jem
> > ----------
> > From:         Skip Williams[SMTP:skipwilliams@pobox.com]
> >
> > Jeremy,
> >
> > You may not understand my recommendations.  Tom A had a 21/3.4 Super




> > Angulon custom-fitted with the goggles from a 35/2 M3-era Summicron.  He
> > also had the 21 modified so that it brings up the 28mm frameline on an
> > M6.  So when you look through the finder, you see the 28mm framelines
> > expanded to the 21mm's angle of view.  The rangefinder focusing is not
> > affected.  Yes, it's a bit larger package, but not much more than the lens
> >
> > and a separate finder pair.
> >
> > Skip
> >
> > At 3/24/00 10:27 AM  +0000, you wrote:
> > >Skip,
> > >But the drawback is the size of the lens package you're carrying around
> > AND
> > >the fact that you  loose your rangefinder focusing except at infinity!
> > >
> > >I'd certainly prefer a dedicated w/a Leica, but the difficulty might be
> > the
> > >correct triggering of the frames with older lenses. As there was never a
> > >defined setting for their frame triggering lugs I suspect that 21 and
> > 24mm
> > >lenses might trigger a variety of framelines.
> > >If we work on the basis that there are only 3 positions available for
> > >frameline triggering it follows that if we see the range as 21 - 35 to
> > >include 24 and 28, then there are 4 focal lengths to look after, as on
> > the M4
> > ------SNIP-------


- -----------------------------------------------
Skip Williams
Westfield, NJ
skipwilliams@pobox.com
http://www.skipwilliams.com
- -----------------------------------------------