Heliopan use Schott glass for their filters.
On this page appears some data in graph form. Someone knowledgeable could
perhaps shed light on the significance of the wavelengths below 430nm....
http://www.heliopan.com/helio1.htm
Team-Foto on the 'bay thing had my 55mm linear polarizer multicoat version
delivered UPS inside 4 weeks for $47(+) including UPS shipping. I have not
shot any film through it, but it oozes quality in appearence and feel. When
viewed to reflect it reflects a sort of greenish image. Index numbers 1 to
20 span half the rim circumference and is further marked "Pol lin MC 2.5x".
I would agree that often no filter is better than any filter. But for the
times when I want one, these are the ones I am going to invest in from now
on.
Cheers
Lee
----Original Message Follows----
From: "C.H.Ling" <chling@xxxxxxxxxxxxx>
Reply-To: olympus@xxxxxxxxxxxxxxx
To: olympus@xxxxxxxxxxxxxxx
Subject: Re: [OM] Using/not using filters/Cleaning lenses
Date: Tue, 06 Aug 2002 11:49:05 +0800
I think hardly noticeable cleaning marks will not affect image quality
but IMO any filter will affect the image quality as I really worry
about the refraction by the thickness of the filter glass.
C.H.Ling
Charles Sdunek wrote:
>
> I think that hardly noticeable cleaning marks would degrade an image
about
> the same as a clean high quality filter.
>
> Charles
>
> At 04:55 PM 8/5/02, you wrote:
> ><snip>
> >An aside to those who look for cleaning marks with loupes, do you really
> >believe you will ever see a cleaning mark in a print that you had to
search
> >the front of the lens for with a loupe???!!!
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