Archived posting to the Leica Users Group, 2007/10/15

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Subject: [Leica] George: 28mm Summicron IR problem
From: imagist3 at mac.com (Lottermoser George)
Date: Mon Oct 15 06:44:43 2007
References: <101420070059.28034.47116A070007353B00006D82219791299503010CD2079C080C03BF970A9D9F9A0B9D09@mchsi.com> <7D2A7130-138A-4816-9457-9D93E46AA357@comcast.net>
 
For color and panchromatic M8 work with the 28 'cron I use a Leica IR/ 
UV filter (not sure who manufactures their filters).
For IR M8 work I use a B&W 093; which works just fine with the 35 lux  
asph and 50 lux asph; yet displays the hot spot on the 28 'cron.

The fact that Len indicated the the phenomenal effect diminishes with  
use of a "red" filter; would indicate that the phenomenon has to do  
with the wave lengths processed by the optical system.

Regards,
George Lottermoser
george@imagist.com



On Oct 13, 2007, at 8:54 PM, Leonard Taupier wrote:

> I'm not sure but I think George may be using a Hoya on his  
> Summicron as well.
Replies: Reply from henningw at archiphoto.com (Henning Wulff) ([Leica] George: 28mm Summicron IR problem)
 In reply to: Message from grduprey at mchsi.com (grduprey@mchsi.com) ([Leica] George: 28mm Summicron IR problem)
Message from len-1 at comcast.net (Leonard Taupier) ([Leica] George: 28mm Summicron IR problem)