World’s most color neutral CPL. 100% Guaranteed.

The moment you use the X4 CPL, you know you’ve 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 that’s just the beginning.

To achieve the worlds most color neutral performance, we had to develop a unique approach to manufacturing rather than selecting off-the-shelf CPL film common among filter manufacturers, which is designed and intended for LCD panels, not photographic optics.

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. With our X4 CPL film we achieved a gradual transmission decrease from 600nm onward, and instead of spiking uncontrollably near 650nm and far into infrared, the X4 CPL sees very controlled transmission into IR, without the curve spike. The real world result? Warm and lively images without the apparent color cast.

High transmission and true color neutrality.

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.

When filter makers use off-the-shelf polarizing films originally designed for LCD panels, it produces a predictable transmission increase at 650nm onward and a spike in transmission around 680nm and into IR. During our research into alternative manufacturing methods, we were able to solve this problem. As a result the X4 CPL sees a decline in IR transmission across the visible spectrum and is very well controlled throughout the IR range.

A winning design proven by outdoor photographers.

We engineer every one of our filters to withstand a lifetime of use in extreme wind, salt water, dust and any other abrasive elements found in nature. The X4 CPL is precision machined from high-quality brass with our signature traction frame. Our rugged design was developed for durability and to make it easy to securely attach and remove the filter - even with gloves in cold conditions.

We stand behind every filter we make with our 25 Year Ironclad Guarantee. Our team spent years developing each aspect of the filter to maintain optical performance and reliable function for a lifetime of use. So we guarantee that our filters will remain free from manufacturers defects for 25 years from the date of purchase.