0ozma Member 246 posts Joined Oct 2008 More info | Oct 28, 2008 18:50 | #1 I have a polarizer and a few days ago I was messing around with it.... I pointed it by itself (not on a lens) at my computer screen and it completely blocked out any light coming from the computer screen (looked like it was turned off) while the rest of the room was lit up.... Canon 50D | Canon EF 50mm F/1.4 | Canon 70-200mm F/4 L | Canon 17-55mm F/2.8 |
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SwiftFootTim Goldmember  1,054 posts Likes: 3 Joined Nov 2007 Location: Michigan More info | Oct 28, 2008 19:50 | #2 A polarizer works by filtering out rays of light that are at a certain angle. Perhaps you found the angle and stopped them. I don't have any diagrams or anything to show you what I mean but put your polarizer in front of you and spin it. At some point it should dim the screen if the monitor is only putting off light in one general way. Canon 1D MkIII, 580 EX II, 70-200mm f/2.8L IS, Sigma 300 f/2.8 EX DG HSM, Lowepro Flipside 400 AW
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Jon Cream of the Crop  69,628 posts Likes: 227 Joined Jun 2004 Location: Bethesda, MD USA More info | Oct 28, 2008 20:10 | #3 LCD monitor? LCDs rely on polarization to show the image. Jon
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p4olom Senior Member  354 posts Joined Jun 2008 Location: Los Angeles More info | Oct 28, 2008 21:24 | #4 Yeah I did the same thing as well and it blocked all the light from my LCD. 7D
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Oct 28, 2008 22:43 | #5 thanks... Canon 50D | Canon EF 50mm F/1.4 | Canon 70-200mm F/4 L | Canon 17-55mm F/2.8 |
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JWright Planes, trains and ham radio...  18,399 posts Likes: 35 Joined Dec 2004 More info | Interesting effect... When I held the polarizer up to my laptop screen and rotated it all it did was change the color of the screen slightly. When I flipped it ove so the threads were facing me and rotated it, it blocked out all the light coming from the screen. John
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msowsun "approx 8mm"  More info | Oct 29, 2008 19:38 | #7 Here is another cool trick: Mike Sowsun / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.4 USM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 100-400 II / EF 1.4x II
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SnlpeR Goldmember 1,013 posts Joined Dec 2007 More info | ^^^^
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msowsun "approx 8mm" More info | Oct 30, 2008 06:08 | #9 Now for the second part: Mike Sowsun / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.4 USM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 100-400 II / EF 1.4x II
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SnlpeR Goldmember 1,013 posts Joined Dec 2007 More info | i see dead people...
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Jon Cream of the Crop 69,628 posts Likes: 227 Joined Jun 2004 Location: Bethesda, MD USA More info | Oct 30, 2008 09:33 | #11 JWright wrote in post #6587200  Interesting effect... When I held the polarizer up to my laptop screen and rotated it all it did was change the color of the screen slightly. When I flipped it ove so the threads were facing me and rotated it, it blocked out all the light coming from the screen. CP. Wouldn't need to flip it with a linear; you'd get the same thing either way. msowsun wrote in post #6589868 Now for the second part: You need to look through the polarizer at the reflected image of the polarizer in the mirror. If it doesn't work, you have a linear polarizer, or you need to turn your circular polarizer around. SnlpeR wrote in post #6590714 i see dead people... im looking thru the polarizer...mirror...back at polarizer and if i line the polarizer to itself on the mirror...the polarizer goes deep purple is this the illusion? edit: i take back the seeing dead people...im freaking myself out now sorry Yep. And yes, you are. Jon
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