Archived posting to the Leica Users Group, 2001/02/27

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Subject: RE: [Leica] Filters and Lens Testing
From: "Austin Franklin" <austin@darkroom.com>
Date: Tue, 27 Feb 2001 09:56:50 -0500
 
> Isn't it fairly wide and accepted optical knowledge that adding
> air-glass surfaces to the light path reduces contrast?

Perhaps, but I'd like to know how much and see some test results, or example
photos that show this so I can see how significant the degradation is.