Archived posting to the Leica Users Group, 2004/10/28

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Subject: [Leica] Infinity and beyond
From: jean.louchet at (Jean Louchet)
Date: Thu Oct 28 11:07:54 2004

Hi all,

No, John, what Alexander says means that the RF coupling is just right (he
gets a clear cut image in the RF patch when the lens is set at infinity or
close to), what is wrong is where the lens focus ring stops. What he does
not say is whether his pictures are sharp when he relies on the RF, but it
seems they are (?)

If it is so, then adjusting the rangefinder would put it all out of
adjustment: don't do it!

Alexander, I'd say that as long as the rangefinder coupling is right, you
can live with this little problem and your pictures should be sharp.
Sorting out this problem is tricky, as on most lenses the stop is
contained in the focus adjustment ring itself, not in the barrel just
underneath that actually controls the optical block's position. If you are
already used to take a lens apart and adjust it, you may remove the small
screws (4 I think) on the focus adjustment ring, pull the focus ring
out of the lens and check what is wrong with the stops. The difficulty
there is that if you don't put it back exactly in the same position it was
before, your lens will have to be completely re-adjusted, which requires a
couple of special tools. Personnally, I do this sort of things on Soviet
lenses but I would not take the risc on a summicron.

First thing to do is check it your images are sharp at full aperture. If
they are, then I would keep it as is. If not, then a good workshop... but
the fault is in the lens.

> From: John Collier <>
> Subject: Re: [Leica] Infinity and beyond
> Not an unknown problem and easily fixed in a CLA. I am assuming you
> have several lenses and only this one goes past infinity. If you only
> have one lens, one body then just adjust the rangefinder to suit.
> John Collier
> On Oct 28, 2004, at 12:31 AM, Alexander Glissan wrote:
> > I have a 1970's 'cron f2 which seems to go to infnity and then a bit
> > past it. When focussing though I get a clear cut image in the RF patch
> > at or just before infinity and then as I rotate the focus past the
> > infinity mark, my image goes a little bit out of focuss. Is this a
> > known personality trait of this lens or does it needs fixing?

Replies: Reply from jbcollier at (John Collier) ([Leica] Infinity and beyond)