Re: [Leica] Using screw to M adaptor ring ? Need Help

[ralph fuerbringer <rof@mac.com>]

having used the original leitz adapters for years they did not always line
up precisely. as long as the adapter is the proper thickness or in this case
thinness is probably more to the point it makes no difference. when you have
two sets of screw threads, one on the lens, one in the adapter exact
matching is iffy and unimportant providing the spacing is correct. a hand
gadget if you can find one is a little tube the thickness of the m body with
a grouond glass at one end and an m-mt spaced to match a m body at the other
end. it of course has other uses...ralph

> From: John Coan <jcoan@alumni.duke.edu>
> Reply-To: leica-users@mejac.palo-alto.ca.us
> Date: Sun, 30 Jul 2000 03:41:17 -0400
> To: leica-users@mejac.palo-alto.ca.us
> Subject: [Leica] Using screw to M adaptor ring ? Need Help
> 
> I recently acquired a used Voigtlaender 15mm screw mount, and purchased
> a Voigtlaender adapter ring.  I have a few questions that I hope the
> group can help me out with.
> 
> 1.  The instructions say put the ring on the M body and lock it in, then
> screw in the lens.  I always figured I would leave the ring on the lens,
> and bayonet the lens on and off like a normal lens.  Any problem with
> that?
> 
> 2.  When screwed all the way in, the focus indicator mark which should
> be centered at the top is a few degrees to the left (when looking
> down).  Sort of like it is screwed in a little bit too much. Will this
> have any practical effect on focus?  I've never owned a screw mount
> Leica and do not know how precisely the threads are cut to make the lens
> line up perfectly when screwed in tightly. On my combo, the lens isn't
> tight unless screwed in a little past the mark.
> 
> Thanks in advance for the collective wisdom of the group.
> 
> John