From: jaimie (nospame)
Subject: Identify pl filter
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Newsgroups: rec.photo.equipment
Date: 2004-07-23 14:29:56 PST

I am new to the filter and lens.  Hope I can get good advices here.
I went to ebay and got a set of used filters for my digital camera.
There
is one Hoya PL lens.  I doubt it is linear pl, but not sure.  Does
that
matter for digital camera if it is not cir-pl?  Also, how do I tell it
is
standard or double coated lens without the retail package?
Here is the link to see the filter.
http://home.comcast.net/~msteapot99/hoya-pl-640.JPG
Filter was made in Japan.

Thanks in advance.
Jaimie

Hi Jaimie  
I pretty sure it's a linear polarizer. The delta arrow & double rings
say linear. Multi coated filters differ in their appearance, but in
general, the more coatings the wilder the color. Zero coating looks
like plain glass. Single coating has a pail color. And multiple
coatings look like something a rock star would wear. Hopefully another
poster can give you a better way to identify multiple coating.
Best Wishes, John