Archived posting to the Leica Users Group, 2011/08/24

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Subject: [Leica] 40mm Summicron on an M9
From: geordiepete211 at yahoo.co.uk (Peter Cheyne)
Date: Thu, 25 Aug 2011 14:38:24 +0900
 
Hi James,

you probably know this, but Leica lenses often tell you a more precise  
indication of the focal length.  For example, my 50 Summicron has the  
digits 22 inscribed to the right of the 'm' for meter inscription.   
That means they reckon my copy of that lens is a 52.2 mm.

I don't know how they indicate if the lens is shorter than the  
designated focal length.  Anyone know?  Or did they always vary on the  
side of slightly increased, rather than decreased focal length?   
Anyway, knowing more about this might help you to decide to tell the  
M9 you are using a 35 'Cron (non-Asph) or a 50 'Cron.

All the best,

Peter