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Archive 2012 · Circular Polarisers - how different can they be?!
  
 
Pablosammy
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p.1 #1 · p.1 #1 · Circular Polarisers - how different can they be?!


Well, I've now got a Cokin circular polariser, and managed to get hold of a Kaesemann B&W MRC one for reasonable money. Well, wow... the polarising effect from the B&W must be double what the Cokin is. I'd assumed the Cokin one was decent quality, but there is no comparison at all!

Did I have a duff Cokin, or is this expected?



Oct 18, 2012 at 08:18 PM
3iron
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p.1 #2 · p.1 #2 · Circular Polarisers - how different can they be?!


Cokin is not up to the BW stuff, there is no doubt. You will get less distortion as well.


Oct 18, 2012 at 08:37 PM
kenbennedy
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p.1 #3 · p.1 #3 · Circular Polarisers - how different can they be?!


They can be quite different, as you found. Please refer to the linked test/article if you are interested.

http://www.lenstip.com/115.3-article-Polarizing_filters_test_Test_procedure.html



Oct 18, 2012 at 08:43 PM
Pablosammy
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p.1 #4 · p.1 #4 · Circular Polarisers - how different can they be?!


Teaches me for skimping on filters! Very interesting read, cheers.


Oct 18, 2012 at 09:22 PM
 

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lsutigerfan
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p.1 #5 · p.1 #5 · Circular Polarisers - how different can they be?!


I am waiting on my B + W 77mm KSM X-PRO CPOL for $160! I did NOT want to pay that, but my only other consideration was the Marumi 77mm CPOL. It was much cheaper, but I didn't think the build quality would be QUITE AS GOOD as the B+ W. I usually skimp on filters but I had to get the B + W after how easy its supposed to be in cleaning and no vignetting -- supposedly. We'll see. The Marumi has reports of "sticking" to lens mounts because profile is way to thin.


Oct 19, 2012 at 04:03 AM
dsjtecserv
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p.1 #6 · p.1 #6 · Circular Polarisers - how different can they be?!


I used the Cokin sprocketed filter in a Cokin holder for several years before moving to a threaded B+W. I had no compliant about the polarization performance of the Cokin, even after using the B+W. The big difference, and the reason I made the change, is that the Cokin was very prone to flare and reflections from the back surface. the B+W is a big improvement in that respect. So, if you were using the same Cokin as I was, your observations surprise me.

Dave



Oct 19, 2012 at 05:30 PM
dsjtecserv
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p.1 #7 · p.1 #7 · Circular Polarisers - how different can they be?!


3iron wrote:
Cokin is not up to the BW stuff, there is no doubt. You will get less distortion as well.


Distortion? How do you mean?

Dave



Oct 19, 2012 at 05:31 PM





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