Archived posting to the Leica Users Group, 2001/07/18

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Subject: Re: [Leica] 28mm f/1.2 - it's in the new Leica Program catalog
From: shino@ubspainewebber.com
Date: Wed, 18 Jul 2001 11:12:42 -0400 (EDT)
 
frank,

wouldn't it be f1:2 == f2 ?

since f is the ratio of focal length to aperture diameter?

it's a simple typo to make 1:2 into 1.2

the english and german pages of the leica website use slightly different
nomenclature :

(english)  SUMMICRON-M ASPH.          f/2/28 mm
(german)   SUMMICRON-M ASPH.          1:2/28 mm

- -rei


> From: "Frank Filippone" <red735i@earthlink.net>
> 
> It is quite common to see apertures marked ...  F1:1.2  ... meaning F2.  I
> remember someone posted an explanation of this, but I am too fuzzy to
> remember the precise reason this was common and correct.
> 
> It is not an error, but another way to say the same thing.....
> 
> Frank Filippone
> red735i@earthlink.net
>