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Cameras, Lenses and Accessories: Discuss On polarising filters...Aeons ago, while shooting analogue, I bought a Marumi polarising filter for my Minolta X-700. One of the things I ...
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Old 25-02-2012, 16:44   #1 (permalink)
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On polarising filters

Aeons ago, while shooting analogue, I bought a Marumi polarising filter for my Minolta X-700. One of the things I wanted to get recently for my Nikon D-5000 was something equivalent, since it was then great for reducing all kinds of water and glass reflections. So I bought a Hama circular one. It does reduce the quantity of light entering the camera, of course, but I was a tad frustrated when I could not see the same results as with analogue. No matter how I move the filter's ring, reflections on my subjects remain almost the same. The only nice thing I have obtained are some light refractions on some pictures I took.



So what's the deal? Were analogue results more evident than digital or was the brand I bought recently not that good?

//Slightly off-topic: in british English, does one spell "filter" or "filtre"?
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Old 25-02-2012, 17:11   #2 (permalink)
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Re: On polarising filters

Are you seeing a reduction in the reflections through the viewfinder and these are not showing the same reductions in the image?
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Old 25-02-2012, 17:34   #3 (permalink)
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Re: On polarising filters

No Dabhand, I am not seeing the reduction even through my viewfinder. In analogue I could see a big difference as I was composing the shot. With digital, it feels as though if it were a measly UV filter =)
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Old 25-02-2012, 17:48   #4 (permalink)
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Re: On polarising filters

If you can't see any difference it might be that there is a problem with the filter.

As you rotate the filter it should fade between a dark point and a light point. These filters are also less effective when using wide angle lenses and will often give a banded effect across the image with a wide angle lens.
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Old 25-02-2012, 17:52   #5 (permalink)
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Re: On polarising filters

I'll talk with the vendor, Dabhand. Much appreciated.

Last edited by Mosh; 25-02-2012 at 18:02.
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Old 26-02-2012, 07:17   #6 (permalink)
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Re: On polarising filters

Could be that the Marumi is a linear polarising filter - which are said to be more effective than circular (but can interfere with the AF or metering on more recent cameras so circular are needed)
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Old 26-02-2012, 09:37   #7 (permalink)
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Re: On polarising filters

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Originally Posted by Markulous View Post
Could be that the Marumi is a linear polarising filter - which are said to be more effective than circular (but can interfere with the AF or metering on more recent cameras so circular are needed)
I thought of that too, but a linear poloriser should still fade from dark to light when it is rotated. I guess that a test of a different brand filter would show if the original one is faulty.
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Old 26-02-2012, 12:59   #8 (permalink)
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Re: On polarising filters

The sensor, like film, should just record what comes through the lens, and the light should have been affected by the polarising filter before that point. It is, I suppose, just remotely possible that the micro lenses fitted to a sensor might have a polarising effect, but this wouldn't alter the basic results of a polarising filter.

Linear polarisers are more effective than circular ones (as well as less expensive) but they do still have an effect. The effect does depend on the light entering having a polarised component, of course, and not all reflections do.
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Old 26-02-2012, 15:15   #9 (permalink)
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Re: On polarising filters

Have you tried checking it off-camera? If you look through it to the sky, you should be able to see changes when rotating it on your hand. The strongest effect is observed when looking in a direction 90 degrees away from the Sun. As others have said, there might be something with your polarizer. I have a relatively cheap one of the same make, but its effect is quite noticeable.
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Old 26-02-2012, 18:15   #10 (permalink)
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Re: On polarising filters

My guess is that Markulous has hit on a likely reason. I too used a linearly polarised filter in my film photography but have have to use circular polarisers now for focussing. It is most unlikely this is anything to do with digital v film as it is an optical effect. I think that you could still use a linear polarising filter but just use manual focussing which you would probably use for your example anyway.

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Old 29-01-2013, 04:31   #11 (permalink)
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Re: On polarising filters

I have the sme problem same make filter , maybe digital does not work the same as film
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