Archived posting to the Leica Users Group, 1997/12/12

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Subject: Re: Was: Re: [Leica] filters for M-lenses; Now: ABSORBAN
From: Dan Cardish <dcardish@microtec.net>
Date: Fri, 12 Dec 1997 21:56:53 -0500

At 06:37 PM 12-12-97 -0800, Jim wrote:
[snip]
>that could be 1959 or 1950. This is also the article that a Leica lens
>designer was quoted... "If we had meant for our lenses to have a flat piece
>of glass in front, we would have designed them that way." The article also
>said that "any filter adds aberration, very much like spherical aberration.
>This will be more pronounced with thicker filters, but even thinner better
>filters, produce this effect."

I'm still waiting for someone to show me a before/after example of the
detrimental effects of using UV filters on Leica lenses.  I'm less
interested in what effect some optical engineer at the factory says that a
filter *may* have on the optical properties of a lens.  I want to be able
to see it.

Dan C.