Archived posting to the Leica Users Group, 2001/11/29

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Subject: Re: [Leica] Re: DR-SUMMICRON - with strange aperture scale
From: Eric Calderwood <>
Date: Thu, 29 Nov 2001 14:23:49 +0000

Seth ,

You are absolutely correct , had a minor panic here initially , I was
looking at the number on the focussing mount upside down ( or for our
Australian LUGgers downside up ) and without a magnifying glass handy
thought they were completely different !!!! However on checking the correct
way around (looking from the outside in ) then the lens numbers are indeed a
perfect match.

Thanks for all of the interesting info.

BTW the 51.9 N on the actual lens head appear to be scratched on to the side
of the actual black internal lens tube , which holds the lens elements.

Best Regards

(Liverpool U.K.)

on 29/11/01 1:48 pm, at wrote:

> In a message dated 11/29/01 8:31:44 AM Eastern Standard Time,
> writes:
>> I have just unscrewed the lens head on my DR Summicron an do indeed see the
>>  inscription you mention.
>>  My lens number 1833907 is marked 51.9 N , hope this is info is of some
> help.
>>  Best Regards
>>  Eric
> Thanks, Eric. It gets curiouser and curiouser. I haven't seen the "N" before.
> Also, I should have mentioned in my first post to Dan that if the focussing
> mount is indeed the one furnished with the lens head when new, the same
> serial number the lens head bears should be printed on the black ring of the
> focussing mount that you are looking at when the lens head is removed.
> Seth      LaK 9
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