Similarily, there are single element 'close up' lenses that are only one
element like a filter and they screw on like a filter but are called lenses.
Kenneth Waller
http://www.pentaxphotogallery.com/kennethwaller
----- Original Message -----
From: "Daniel J. Matyola" <danmaty...@gmail.com>
Subject: Re: What's in the name?
I understand that Igor. Despite what evidences of ignorance I may
post here, I do know the difference between a lens and a filter.
I had assumed that the terminology originated when it was first
applied to a lens that had the polarizing built into the lens itself,
and that was later replaced by a filter that could be uses on any lens
of an appropriate diameter.
Dan Matyola
http://www.pentaxphotogallery.com/danieljmatyola
On Thu, Jul 23, 2015 at 11:33 AM, Igor PDML-StR <pdml...@komkon.org>
wrote:
Dan,
And I assume you know why that would be incorrect usage?
Because (hopefully!) no "lensing" occurs in a filter (which is supposed
to
have flat, plane-parallel surfaces).
Cheers,
Igor
Daniel J. Matyola Thu, 23 Jul 2015 07:36:01 -0700 wrote:
I thought that "PL" stood for "polarizing lens."
Dan Matyola
http://www.pentaxphotogallery.com/danieljmatyola
On Thu, Jul 23, 2015 at 10:32 AM, Igor PDML-StR wrote:
<...>
Now, my 3 guesses that I mentioned yesterday but didn't write to avoid
any
bias were: lens, light, and luminescence that would be in the scientific
term "circularly polarized luminescence". Obviously, none of these would
be
correct in "CPL filter".
Igor
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