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 Post subject: Polarizer filter problem
PostPosted: Tue May 04, 2010 9:34 am 
Yesterday I've decided to take a polarizer filter on my 18-105mm for some street photography,because there was a lot of light (so loosing a few stops didn't matter) & the sun was in the right position for the filter to work well.
So I made a few tests first...the conclusion was that I was loosing sharpness. I know this shouldn't be normal,so what I am doing wrong?

Here's some examples,100% crops,of a taxi cab door:
-with polarizer
http://farm5.static.flickr.com/4059/457 ... 26e0_o.jpg
-without polarizer
http://farm5.static.flickr.com/4037/457 ... bba1_o.jpg


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 Post subject:
PostPosted: Tue May 04, 2010 9:44 am 
Is it a brand polariser or a cheap one bought off eBay?


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 Post subject:
PostPosted: Tue May 04, 2010 9:49 am 
Hoya.
And in perfect condition,I might add.


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 Post subject:
PostPosted: Tue May 04, 2010 11:42 am 
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Location: UK
Can't tell from the small crops, but my suspicion is the focus is off on the with polariser sample. If you look at the original is another part in better focus?

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Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
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 Post subject:
PostPosted: Tue May 04, 2010 11:52 am 
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Location: Scotland
I've personally always found polarisers to slightly soften my images, i no longer use them and to protect the lens i use lens hoods instead.

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Mark Osborne
My life through an iPhone


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 Post subject:
PostPosted: Tue May 04, 2010 8:54 pm 
All the sample "speak" of the same thing...softer images with the polarizer. I'm very dissapointed...& they cost me some serious money as well. I really thought that the glass in the polarizer filter doesn't affect the quality of the photos & no forum ever spoke about quality loss.


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 Post subject:
PostPosted: Wed May 05, 2010 8:34 pm 
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Location: UK
Just did a test with the Hoya HD polariser. Canon 7D, ISO100, aperture priority f/5.6, EF 15-85 at 85mm, tungsten WB (I just wanted to be sure it stayed the same during test). I used AF without the filter in place to lock then switched the lens to MF for following shots, as my first attempt at this showed only that the shot to shot focus accuracy caused sharpness variation in itself. AF spot was over the right column of the crop. Tripod mounted, IS off, remote release. 100% crops.

Image
No polariser or any filter.

Image
Polariser in one random orientation.

Image
Polariser rotated 90 degrees from before.

Spot the difference? To me there is a slight colour cast on the polariser shots, but I couldn't say there was any significant difference in sharpness in this test.

If you look at the exif, there is one stop light loss from the polariser.

Ok, I tested only one rather expensive polariser. I can't say that all will behave like this, but certainly this one doesn't appear to degrade the sharpness.

_________________
Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.


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 Post subject:
PostPosted: Wed May 05, 2010 8:56 pm 
This is even more annoying! :) My polarizer filters "drain" 3 stops. So unless my camera has some polarizer hate incorporated,the more expensive type of polarizers are the real deal.

Thank you popo for the tests!


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 Post subject:
PostPosted: Wed May 05, 2010 9:08 pm 
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Location: UK
I guess I should add, in this condition the polariser had very little effect on the image. If you were shooting reflection conditions, then maybe the light loss would be more significant.

_________________
Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.


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