Circular Polarizers reviewed

[upnorth47]

I found this review and was wondering if anyone heard of or used the: Marumi DHG Super Circular P.L.D 77 mm fillter? I am in the market for a CP and would welcome any comments or suggestions. It is for a Nikon 300 F4 AFS, and I do want one that will keep the lens cap.
The article is very interesting:

http://lenstip.com/115.4-article-Polarizing_filters_test_Results_and_summary.html

 

[pluton]

I never heard of Marumi either. How 'bout that fake circular-polarizer from B+W??
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-KB-

 

[Rick L]

Something strange going on, either with the test of B+W. Supposedly the only difference with the KSM filters versus the regular MRC is weather sealing, so why the different performance. One should be concerned about results that don't reflect the testing margins of error, so you don't really know if one is superior to another.
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Rick L
http://www.pbase.com/ricklawrence/root

 

[A Romanov]

Something strange going on, either with the test of B+W. Supposedly the only difference with the KSM filters versus the regular MRC is weather sealing, so why the different performance. One should be concerned about results that don't reflect the testing margins of error, so you don't really know if one is superior to another.

From B+W brochure: "The “high-end” polarizing foils of the Käsemann-type filters are neutral in color, they have a higher efficiency than conventional polarizing foils and they are cemented between high-grade plano-parallel optical glass. The resulting sandwich is then precision-polished again to achieve highly accurate plano-parallel surfaces."

Sounds like glass is different and foil might as well be different... However the disqualified "fake" EW C-POL should be a wide-angle oversized mount version of the normal Käsemann C-POL MRC if I understand anything at all

Very strange indeed...

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AR