Archived posting to the Leica Users Group, 1999/07/19

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Subject: Re: [Leica] Collapsible 4/9cm Elmar
From: Dan Cardish <dcardish@microtec.net>
Date: Mon, 19 Jul 1999 12:59:04 -0400
 
Here's my first dumb question for the week (It's only Monday), how does one
determine where the aperture blades are situated, short of taking the lens
apart?

Dan C.

At 01:42 PM 19-07-99 -0400, Marc wrote:
>If Leitz did it this way, they had a reason:  I now suspect that ALL
>collapsible 4/9cm Elmars have the diaphragm between the first and second
>elements, and not between the second and third as is standard in all other
>four-element Elmars.  The reason is probably the arrangement of the
>aperture dial.
>
>What is especially interesting is that so many of the authorities (Laney,
>Lager, van Hasbroeck, even Rogliatti) seem to have missed this change.