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Old May 9, 2007, 9:28 AM   #1
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Took this shot yesterday - we were having 28 degree (celsius) weather, ridiculous for this place at this time of year (it's something like 88F?!).

First time i got the desired results from my new polariser, as well!
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Old May 9, 2007, 1:22 PM   #2
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Great lines.



Love the sky...makes a great argument for the polarizer.
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Old May 9, 2007, 5:48 PM   #3
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Nice shot. Your polarizer worked well.

Have you ever had a polarizer turn the sky black? I have Cokin polarizer and the first time I tried it out on some glass sided buildings, it actually turned the sky black. I couldn't believe my eyes. I was shooting almost straight up and that might have something to do with it.

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Old May 9, 2007, 10:23 PM   #4
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Cal, to be honest i haven't seen too much effect from my polariser at all till i took the shots in this series. I am still trying to figure out when and where it works best.
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Old May 10, 2007, 10:35 AM   #5
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Dr V, a polarizer has its greatest effect when the sun is 90 degrees from your subject. In other words, if your subject is straight in front of you, the greatest effect will be obtained when the sun is 90 degrees to your right or left. If the sun is behind your subject or behind you, the polarizer will have little effect except to act as a neutral density filter with 1/2 to 1 f-stop of overall light reduction.

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Old May 10, 2007, 10:00 PM   #6
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in my experience a polarizer will deepen the sky's blue. Regardless of where the sun is.
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Old May 10, 2007, 10:41 PM   #7
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thanks cal! i appreciate the tips!!
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Old May 10, 2007, 11:35 PM   #8
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I posted a response to Matthew's remarks but I guess I didn't hit send.

Matthew, if you don't see any difference regardless of the sun's position, this leads me to think you are not using the filter properly. If the sun is in front or behind you, you should see no effect when you rotate the filter. However, with the sun to either side, you should see significant changes in sky brightness and folliage brightness as you rotate the filter. If you don't rotate the filter for the desired effect, you are probably only seeing the neutral density effect due to the dark color of the filter.

I think we will have a challenge on polarizers in the next couple months.

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Old May 10, 2007, 11:51 PM   #9
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quick question, cal. I had heard the 90 degree figure before, but i didn't know what effect height of the sun played (if any). Does the vertical position of the sun affect the polarizer's effect?
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Old May 11, 2007, 11:17 AM   #10
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Logically, I would think the same optical rules apply in the vertical plane as well as horizontal. Having said that, I would think that if the sun were directly overhead, a polarizer would perform well even though that is the worst time of day for shooting. I have no empirical evidence to support this but is seems logical.

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