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The following photos of the floor in my lounge room show the effect of using a polarizing filter. They also confirm that this filter is a circular polarizing filter: linear polarizing filters are reversible, so it doesn't matter which way round you hold them. With a circular polarizing filter, holding them the wrong way round produces changes in colour, but doesn't eliminate reflections.

Polarization has profound effects on the exposure and the colour balance. I took the photos below with automatic colour balance, to see what compensation the camera thought appropriate, and then changed the colour balance to 5000° in each case in postprocessing. I didn't do any other postprocessing.

All photos were taken with an Olympus E-30 camera with Zuiko Digital ED 12-60mm F2.8-4.0 SWD lens at 60 mm. Some people claim to have trouble focusing with polarizing filters. Despite the relatively low light conditions, I didn't have any trouble with these shots.


This should be Floor-unpolarized.jpeg.  Is it missing?
Image title: Floor unpolarized          Dimensions:          4100 x 3084, 1408 kB
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All images taken on Thursday, 24 September 2009, thumbnails          All images taken on Thursday, 24 September 2009, small
Diary entry for Thursday, 24 September 2009 Complete exposure details

 

Polarizing filter in “unpolarized” mode. Colour temperature 5082°, 0.3 sec, f/8.0 (EV 7.7).


This should be Floor-polarized.jpeg.  Is it missing?
Image title: Floor polarized          Dimensions:          4100 x 3084, 1168 kB
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Diary entry for Thursday, 24 September 2009 Complete exposure details

 

Polarizing filter in “polarized” mode. Colour temperature 3654°, 1.3 sec, f/8.0 (EV 5.6). This is two stops more exposure than the previous image, and a colour temperature difference of 1400°


This should be Floor-reverse-polarized-1.jpeg.  Is it missing?
Image title: Floor reverse polarized 1          Dimensions:          4100 x 3084, 864 kB
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Diary entry for Thursday, 24 September 2009 Complete exposure details

 

Polarizing filter reversed, at one extreme of colour change. Colour temperature 5837°, 0.5 sec, f/8.0 (EV 7.0).


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Image title: Floor reverse polarized 2          Dimensions:          4100 x 3084, 1216 kB
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Diary entry for Thursday, 24 September 2009 Complete exposure details

 

Polarizing filter reversed, at the other extreme of colour change. Colour temperature 4238°, 0.3 sec, f/8.0 (EV 7.7), 1600° less than the previous image.


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