Polarizing filter - Circular or Linear?


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Apr 26, 2007
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#1
I wanted to get a Polarizing filter for my Canon 40D, EFS 17-55mm lense. However, I am confused by the type of Polarizing filter.

As far as i had read it from wikipedia, I still don't really understand which one to get, a circular ones or linear ones?

Hopefully, someone at CS could advise me on the type of filters that i should get. Thanks in advance.
 

zac08

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Feb 21, 2005
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#3
I wanted to get a Polarizing filter for my Canon 40D, EFS 17-55mm lense. However, I am confused by the type of Polarizing filter.

As far as i had read it from wikipedia, I still don't really understand which one to get, a circular ones or linear ones?

Hopefully, someone at CS could advise me on the type of filters that i should get. Thanks in advance.
You'd need a circular one for the NEW AF system, the old linear ones are meant for MF.

it's already mentioned in the Wiki :

The metering and auto-focus sensors in certain cameras, including virtually all auto-focus SLRs, will not work properly with linear polarizers because the beam-splitters used to split off the light for focusing and metering are polarization-dependent. Circular polarizers include a linear polarizer on the front, which selects one polarization of light while rejecting another, followed by a quarter-wave plate, which converts the selected polarization to circularly polarized light inside the camera, which works with all types of cameras, because mirrors and beam-splitters split circularly polarized light the same way they split unpolarized light.
 

zac08

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Feb 21, 2005
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#4
circular polarizer filters are highly recommended, if Linear give you free also don't take.
Can still keep...

quite fun when you stack a C-PL with a Linear one... it gives you adjustable ND. :bsmilie:
 

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