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Old 05-05-2013, 01:00 AM   #1
kuksul08
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Question about polarizing filters

I'm a little confused about how the polarizing filters work for dSLRs. What I have in mind is a two polarized layers with individual rings. So you can first adjust the angle of polarization depending on the light source and object reflections, and then rotate another polarized layer relative to the first in order to adjust how much light can enter.

Does something like this exist? I think I saw something in a magazine like that once, but none of the "circular polarizing filters" look like they have any adjustability.

My goal is essentially to be able to keep shutter speed for movies at 1/60 and ISO 100 on very sunny days without having a blown out image. Also to take pictures with both sky and landscape without having the sky be blown out, or objects have too many reflections in direct sunlight.
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Old 05-05-2013, 01:03 AM   #2
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Why not just use a 5 stop neutral density filter? Polarizers cause weird things, especially with two.

EDIT: Try these in combinations:

http://www.amazon.com/Tiffen-58mm-Ne..._bxgy_p_text_y

http://www.amazon.com/Tiffen-58mm-Ne...=3+stop+filter

http://www.amazon.com/Tiffen-58mm-Ne..._bxgy_p_text_z
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Old 05-05-2013, 01:11 AM   #3
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Article about polarizers:

http://www.bobatkins.com/photography...olarizers.html
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Old 05-05-2013, 01:27 AM   #4
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Very cool. Good article, thanks.

So would it be a wise choice to use a circular polarizing filter for general use, and then stack ND filters of various stops on top to get exposure in bright sunlight just right (mostly for video)?

Any recommendations for polarizing filter? My lens is 72mm, and I was looking at this: http://www.amazon.com/HOYA-72mm-Circ...ed+filter+72mm
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Old 05-05-2013, 02:05 AM   #5
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Yeah, the CP helps reduce bad reflections in direct sunlight and stuff. I feel like they could cause more issues than they fix for video. Think about how humans are used to seeing the world... it's definitely not thought a CP.

You said you wanted to take pics of the sky... well keep in mind that with a CP the sky will look weird because the sun hits it at different angles or something like that.



EDITed cause the forums thought the pic I found was spam
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Old 05-05-2013, 02:15 AM   #6
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Hmm interesting. That sky does look weird.

My main issue with video is trying to shoot video in broad daylight. I have had to go down to like f/20 1/60 ISO100 just to get it to look right, but then it reveals any oil or dust on the image sensor at that small aperture. I guess I can use the ND for that, and then the polarizing filter for general images.
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Old 05-05-2013, 02:26 AM   #7
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Nah, get the CP first and see how you like it
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Old 05-05-2013, 02:59 AM   #8
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I'll get...

ALL THE FILTERS!
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Old 05-07-2013, 12:53 AM   #9
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Any input on

http://www.amazon.com/72mm-Circular-...arizing+filter

vs

http://www.amazon.com/Tiffen-72CP-72...arizing+filter

Big price difference, similar reviews. Does it make a big difference?
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Old 05-07-2013, 07:32 AM   #10
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Check out maxsaver.net. They are in Hong Kong but the shipping is usually fast.
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Old 05-07-2013, 04:21 PM   #11
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B&H photo video is also good..

I have a Hoya Polar filter and haven't had any issues with it. also have a Tiffen Vari-ND, but haven't used it enough to give an opinion on it.
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Old 05-07-2013, 10:07 PM   #12
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I did a bunch of research on Ken Rockwell. Looks like it doesnt REALLY matter between the upper level multi coated filters, but Hoya and B+W are top notch. I'll probably go with the Hoya HD multi coated.
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Old 05-08-2013, 09:07 AM   #13
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look at Promaster Digital HGX too.

I have Promaster Digital HGX UV filters, they are very expensive, but amazing IMO.
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Old 05-12-2013, 04:04 AM   #14
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I ended up getting the B+W MRC filter due to many positive reviews.

Got it and it had some kind of oily film on the surface. Cleaned it off with eclipse but the MRC coating made the eclipse bead up insanely. What a weird coating...

Shooting with it was interesting and adds another level of complexity. It has to be constantly adjusted depending on where the light is, so not too good for very dynamic environments. Also I'm just an amateur at this.

Lastly, I noticed some vignetting with a uv filter stacked on top, so if I stack an ND4 on top I will expect the same. I went with 72mm for my 72mm lens so I can still use the hood, but maybe 77mm would have been better, since you can't rotate the ring easily with the hood on anyway! Still learning
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