Archived posting to the Leica Users Group, 1998/04/12

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Subject: Re: [Leica] Leica and Minolta identical calculation
From: dannyg1 <dannyg1@IDT.NET>
Date: Sun, 12 Apr 1998 19:08:34 +0000

> To keep it from turning, it takes a lot more "guts" that take up
> space and weight in the lens

The technical terminology for the apparats that keeps the front group from rotating is a 
'double-helical'. A single helicoid lens rotates and is, by design smaller, because it has 
only one helical. 

DG