Archived posting to the Leica Users Group, 2001/01/16

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Subject: Re: [Leica] M lens lengths + ASPH 28f2 hood
From: Johnny Deadman <>
Date: Tue, 16 Jan 2001 20:34:14 -0500

on 16/1/01 8:20 pm, Rob Studdert at wrote:

> Hi,
> In the process of measuring the lens length from the mounting flange of my
> M lenses in order to design a case I noticed some interesting variations in
> measurements vs printed specifications (users manuals and advertising
> matter seemed to correlate).
> In particular the:
> Summicron-M 50f2 (11826) measured 46mm spec 43.5mm
> Summilux-M 75f1.4 (11810)  measured 82.5mm spec 80.0mm
> Summicron-M ASPH 90f2 (11884) measured 83.5mm spec 78mm

presumably you measured them focused at their minimum distance? otherwise
you are not getting them at their longest.
- -- 
Johnny Deadman