Polarizing Filter

I got a polarizing filter for Christmas this year. I hadn’t even screwed it onto the lens before this week. Why? I don’t know, don’t pick on me. Sheesh.

Anyway I did a few tests while in the mountains. I’d turn it until the sky looked washed out, take a pic, then turn it until the sky was as dark as it could get, take a pic. And so on. Here are a few results.

This one…
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…compared to this one.
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And another test, this one…
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…compared to this one.
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I also did a test of how it handles reflections on water. I turned it so that I could see as much sunlight reflecting off the water as possible, took a pic, turned it so there was as little reflection as possible, took a pic.

This one…
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…compared to this one.
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Did I do it right? As with all things photography, I haven’t a clue. I’m just pushing buttons and turning dials and seeing what happens. Should I do anything different when using the polarizing filter?

Let me know.