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Old Aug 17, 2005, 11:57 AM   #11
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Two more examples. First one without a filter

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Old Aug 17, 2005, 11:58 AM   #12
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This one with a Cokin polorizing filter....

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Old Aug 17, 2005, 4:42 PM   #13
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Most of that effect is from the second exposure being proper to get the highlights and shadows in the clouds and the first being overexposed for the sky.

If you shot in manual and left the settings the same for both shots, you just lowered the exposure by 2 f-stops using the filter – polarizers act as a neutral density filter as well as a polarizer. If you shot in auto exposure the camera is oddly not seeing the filter – most do.

Polarizers can increase cloud sky contrast by darkening the sky some in areas of the sky that are polarized, but it doesn't do anything for shadow detail in the clouds.


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Old Aug 20, 2005, 3:53 AM   #14
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Looking at the building, rather than the sky, it seems that the shots were made at the same manual exposure setting for dramatic effect. A properly exposed frame using a polorizing filter can have a powerful effect on harsh glare and reflections that kill contrast, but it will not change the relative brightness of the shot if metered in the same manner as a non polorized shot..

By the way, light reflecting from metal surfaces has a different character than light reflecting from other materials, and does not respond to a polorizing filter as a pane of glass would.

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Old Aug 20, 2005, 3:16 PM   #15
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Polarization will remove reflections from a flat mirror like piece of metal the same way is does for water or glass. Most metal is curved, brushed, anodized or weathered so it doesn't polarize light well.
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