Archived posting to the Leica Users Group, 2005/02/20

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Subject: [Leica] 12585 Hood....a "REAL" Leica question!!
From: lkhermann at bresnan.net (lkhermann)
Date: Sun Feb 20 06:38:43 2005
 
At 06:57 AM 2/20/2005 -0500, you wrote:
>Since I don't have any of the Leica tomes, yet, I thought I'd ask all
>you Leica gurus....
>
>Why is the 12585 hood vented?
>
>(Cool off those "hot" lenses?????)
>
>Inquiring minds......
>
>Ken Frazier

Although I do not consider myself a guru and I do not seem to have a 12585 
hood, most of the vents in the hoods are to reduce the obstruction of the 
viewfinder.  Some of the early Summicrons were apparently "hot" from the 
Thorium included in the glass used in the lens.  I hope this helps.
Lee