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elf_man
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Polarizing filter doesn't actually change the colors, it cuts out light that comes into the lens from certain angles, so there isn't really anything for the camera to color correct. You will most likely want to take it off when it gets dark, since it cuts out between 1-2 stops. When you rotate it, the effect strengthens and weakens. It cuts out lots of reflections, which tends to increase overall saturation. This is especially noticeable on water, making it easier to see under the surface. One of its signature effects is the deep blue color it can make the sky (pic related). Yeah, I have the camera's saturation turned up, but that's besides the point. At minimal effect, the trees were little more than a dark block, and most of the algae was blocked by glare and reflection from the sky. Since it has a noticeable effect, there may be times that you want to take it off, but seeing as you can minimize the effect, it's very versatile.
Camera-Specific Properties:Equipment MakeNIKON CORPORATIONCamera ModelNIKON D40Camera SoftwareVer.1.10Maximum Lens Aperturef/4.6Sensing MethodOne-Chip Color AreaColor Filter Array Pattern3456Focal Length (35mm Equiv)52 mmImage-Specific Properties:Image OrientationRight-Hand, TopHorizontal Resolution300 dpiVertical Resolution300 dpiImage Created2007:06:29 21:27:43Exposure Time1/40 secF-Numberf/16.0Exposure ProgramAperture PriorityISO Speed Rating200Exposure Bias-0.7 EVMetering ModePatternLight SourceUnknownFlashNo FlashFocal Length35.00 mmColor Space InformationsRGBImage Width3008Image Height2000RenderingNormalExposure ModeAutoScene Capture TypeStandardGain ControlNoneContrastHardSharpnessNormalSubject Distance RangeUnknownISO Speed Used200Color ModeCOLORImage QualityFINEWhite BalanceAUTOImage SharpeningAUTOFocus ModeAF-AFlash SettingNORMALFlash Compensation42.3 EVISO Speed Requested200Tone CompensationMED.HLens TypeNikon D SeriesLens Range18.0 - 55.0 mm; f/3.5 - f/5.6Auto FocusSingle Area, Center Selected, Top FocusedShooting/Bracketing ModeSingle Frame/OffColor ModeLandscape sRGBLighting TypeNATURALNoise ReductionOFFCamera Actuations1990Image OptimizationCUSTOMSaturation 2ENHANCED
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