Archived posting to the Leica Users Group, 2000/04/08

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Subject: Re: [Leica] Summarit lens cap & hood confusion
From: Dennis Painter <dpainter@bigfoot.com>
Date: Sat, 08 Apr 2000 23:14:15 -0700
 
MGMcGough@aol.com wrote:
> 
>   I think that the confusion in regards to lens cap, lens filter & lens hood
>   size lies in the use of inside & outside diameters interchangably.
> 
>   Actually the OD of the Summarit ring is 43mm while the ID is 41mm.
>   There were both screw-in (41) and slip-on (43) filters made for the lens
>   and the screw-ins have always been preferred & more expensive.
> 
>   I have always been under the impression that the first version of the 50
>   f:1.4 Summilux (1959) was optically the same as the Summarit ('49-'60)
>   except for the mount & coating & it used an E43 filter.
> 
>   Mary (de Milo) McGough
> 

My understanding is that the optical formula for the Summarit and the
first Summilux is the same but the Sumilux was recomputed for lanthanum
glases. Same formula, but optically a bit different.

Dennis