Combining Linear and Circular Polarizer -- Canon Accessories in photography-on-the.net forums

Cream of the Crop

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Jun 18, 2008 08:50 | #1

Has anyone ever combined a linear and circular polarizer to form a variable neutral density fiter?

http://findarticles.com/p/articles/mi_m1306/is_1_73/ai_n17154395

This link states that if you place a linear polarizer in front of a circular polarizer, the result of those two filters would be a neutral density filter of sorts which could be adjusted in density by rotating the linear poarizer.

If it works, it would be a nice trick when I need to really slow down my shutter speed, especially when desiring to blur running water.

Darn it, I just threw away a linear polarizer left over from my film days.

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Double Negative

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Jun 18, 2008 15:40 | #2

Sounds similar to a Singh-Ray Vari-ND. Never tried either, but I like the idea of the former... As the latter is ridiculously priced.

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Zoodles

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Jun 18, 2008 15:47 | #3

Would love to hear someone's test results - might definitely be worth a try...

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Jon

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Jun 18, 2008 18:00 | #4

I recall from way back when that stacking linears gave a midnight blue effect.

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Wilt

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Jun 18, 2008 18:08 | #5

As I recall, the result is hardly 'neutral' density. And you need to be careful to put the linear filter out in front (farthest from sensor) so as to permit the quarter wave plate in the CPL to properly 'scramble' the light before it goes to the semisilvered mirror and AF sensor.

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Jon

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Jun 18, 2008 18:23 | #6

Wilt wrote in post #5747822

Not to mention if the CP is in front, you won't get nearly the darkening or variability since the Linear will be dealing with unpolarized light.

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René Damkot

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Jun 19, 2008 07:20 | #7

Jon wrote in post #5747780

I recall from way back when that stacking linears gave a midnight blue effect.

Same here...

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Quad

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Jun 19, 2008 09:27 | #8

Jon wrote in post #5747780

I recall from way back when that stacking linears gave a midnight blue effect.

Thats what I got when I tried it with a very old linear polarizer, that filter is about 30 years old but looks normal by itself.

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