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Re: [OM] Any advice on filters?

Subject: Re: [OM] Any advice on filters?
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Tue, 04 Mar 2014 21:06:42 -0500
Oh, I read your post alright.  It's just that I couldn't relate what you 
said to what I was going to see (or not see) through the polarizer.  In 
your continuation below you don't seem so sure yourself.  :-)

Chuck (a bit befuddled and confused) Norcutt


On 3/4/2014 7:14 PM, usher99@xxxxxxx wrote:
> Harumph, nary a listee read my post, not even Chuck this time.  I
> suppose that is reasonable given the dismal
> senorita count.
>
>    The only real difference with the circular polarizer is the 1/4 wave
> plate--typically designed for the middle of the
> visible spectrum--though this does vary.  The 1/4 wave plate will NOT
> make perfectly circularly polarized light for all wavelenghs
> so in a highly polarized sky there is a slight spectral shift to the
> warm side--PERHAPS that is the perceived difference.
> I have never seen a formal study of this though and it is a working
> hypothesis.  The polarizing foils used have different efficiencies at
> various wavelengths as well but that is true for all the pols.
-- 
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