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Cameras, Lenses and Accessories: Discuss Polariser...Hi all, I am looking for a polariser for my 17-85 IS lens. Any suggestion and manufacturer that I should ...
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Old 14-11-2008, 11:51   #1 (permalink)
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Polariser

Hi all,

I am looking for a polariser for my 17-85 IS lens.

Any suggestion and manufacturer that I should look at or not look at?

Cheers
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Old 14-11-2008, 12:02   #2 (permalink)
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Re: Polariser

I've got Kood and Hoya - not found much/any difference between them.

Make sure you get a circular poloriser, not a linear.
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Old 14-11-2008, 12:03   #3 (permalink)
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Re: Polariser

ok, whats the difference between them?
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Old 14-11-2008, 16:18   #4 (permalink)
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Re: Polariser

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Originally Posted by Slicker View Post
ok, whats the difference between them?
The Linear Poloriser will have a detrimental affect on the Auto Focusing.

An auto focus or auto-exposure camera (basically any modern camera), use a Circular polariser, which won't interfere with its automatic functions. Digital cameras in general do not have reflection mirrors, and, as a result, can use both (linear and circular) polarisers.

If you did use a Linear Poloriser the Auto exposure will be 2-3 stops under exposed. I think it is something to do with with beam splitting metering in the camera so that the light gets polorised twice .Hence under-exposure.

Circular Polariser has linear polarizer construction plus a built-in ""Wave Retardant"" to ensure proper exposure. The linear element polarizes the light, and the wave retardant de-polarizes it, and then the beam-splitting meter polarizes the light again for proper exposure. I think Iv'e got this correct but rest assured it will be corrected if its not.
Brian

Last edited by brian wright22; 14-11-2008 at 19:26.
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Old 14-11-2008, 17:27   #5 (permalink)
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Re: Polariser

nice - thanks for the info..

I will look out for a circular filter.

Cheers
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Old 14-11-2008, 17:49   #6 (permalink)
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Re: Polariser

I use Hoya Circular on the 17-85. Seems good to me.
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Old 15-11-2008, 11:39   #7 (permalink)
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Re: Polariser

ive got a 67mm HOYA pro1 digital UV filter, so do i have a linear one or circular one? how do i know ?
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Old 15-11-2008, 11:52   #8 (permalink)
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Re: Polariser

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ive got a 67mm HOYA pro1 digital UV filter, so do i have a linear one or circular one? how do i know ?
Only polorisers are designated circular or linear due to their different construction, so the designation will not apply to any other type of filter.
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Old 15-11-2008, 12:31   #9 (permalink)
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Re: Polariser

I use Hoya Pro 1 [circular] polarizer digital, seems fine to me,bought from Japan though as it was a lot cheaper, don't have the dealer handy but i,ll get it for you if your interested.
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Old 23-11-2008, 01:31   #10 (permalink)
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Re: Polariser

I have a Kenko, and it works great.
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