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Introducing the worlds most advanced circular polarizer. The moment you use the X4 CPL you know youve never used anything like it. Featuring our all-new American made CPL film and an all-new brass traction frame features best-in-class design and durability. And thats just the beginning. Worlds most color neutral CPL. 100% Guaranteed. All commercially available CPL filters exhibit a yellow cast due to a gradual transmission increase starting around 600nm and then spiking at 650nm onward into IR. The real world result Warm and lively images without the apparent color cast. Transmission spectrum using scan speed of 1200 nm/min at 2.00nm resolution. Analyzed on a Hitachi U-3300. Spectrometers are optical instruments that can detect spectral lines and measure their wavelength or intensity. Spectrometers can also be used to test the efficiency of an optical filter in order to evaluate color neutral performance. A perfectly flat transmission curve would yield a perfectly color neutral result and while there is no such thing as a perfectly neutral CPL filter contrary to what other filter makers may claim the X4 CPL is the most color neutral of any CPL filter guaranteed.Worlds most color neutral circular polarizerguaranteed
Expand dynamic range in-camera
Absolutely the sharpest circular polarizing filter
Built to last and guaranteed to match