Archived posting to the Leica Users Group, 2000/07/25

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Subject: RE: [Leica] Leica or B+W Filters
From: Austin Franklin <austin@darkroom.com>
Date: Tue, 25 Jul 2000 08:44:37 -0400

> Forget about
> single coated filters if you care about not degrading the image quality
> of your Leica lenses.

I am curious what you base this claim on for a filter.  Have you done tests 
your self, or do you have pointers to test that others have done that show 
the image degraded by, say a single (actually double, one each side) coated 
filter, such as Heliopan 'standard' coated filter vs any of the 'other' 
multi-coated filters?  Or is this just hear-say and speculation?