Hi Darren,
So, the initial "PL" was for PoLarizer (as Bill suggested)?
That's weird! But those things happen...
I am recalling that when I saw "PL" many years ago, I actually thought it
could've been for "Linear Polarizer" but possibly in a different language
(e.g. French), where the word sequence is reverse (polarisant lin'eaire).
As for varios markings for Cirular Polarizers, I found that at least two
companies/brands also used "PLD" (Quantaray) or "P.L.D." (Marumi):
http://www.bhphotovideo.com/c/product/800690332-USE/
Any idea what that "D" stands for? And why it is writed with the periods
(dots?) as an initialism?
http://www.marumi-filter.co.jp/en/product/02/dhg_s_cpld.php
(You can see it engraved on the filter.)
In the letter case, it is funny that they write "Circular PL" on the
website.
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
Darren Addy Thu, 23 Jul 2015 04:44:15 -0700 wrote:
It isn't an acronym. PL was originally the abbreviation printed on
linear polarizers from almost all manufacturers. When circular
polarizers came into being (and were necessary to avoid exposure and
focus problems with modern cameras that use semi-silvered mirrors or
prisms to split the light entering the viewfinder in order to
calculate exposure and focusing distance) they had to be
differentiated in some way. You will see them called CPL, PL-CIR, and
PL-C (perhaps others) by various manufacturers.
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