Breakthrough Photography 62mm X4 Circular Polarizer Filter

Introducing the worlds most advanced circular polarizer.

The moment you use the X4CPL, you know youve never usedanything like it. Featuring theall-newAmerican made CPL film and an all-newbrass traction frame featuresbest-in-class design and durability.And thats just the beginning.

Technology

Worlds most color neutral CPL. Guaranteed.

The all-new and internally developed CPL film is at the core of the X4 CPL, and it ismanufactured it right here in California. To achieve the worlds most color neutral performance, theyhad to develop a uniqueapproach to manufacturing rather than selectingoff-the-shelf CPL filmcommon among filter manufacturers,which is designed and intendedfor LCD panels, not photographic optics.

All commercially available CPL filters exhibita yellow cast due to a gradual transmission increasestarting around 600nm and then spiking at650nm onward into IR. With our X4CPL film theyachieved agradual transmission decrease from 600nm onward, and insteadof spiking uncontrollablynear 650nm and far into infrared, the X4CPL sees very controlled transmission into IR, without thecurvespike. The real world result?Warm and lively images without the apparent color cast.

Dynamic Range

Expandyour dynamic range in-camera.

Outdoor photographers frequently struggle with dynamic range, as the human eye has a dynamic range over 20-stops, whilea mid-day outdoor scene (like the one below) may rangebetween 15-18 stops. Professional camera systems range between 12-14 stops, and during the last decade very little expansionprogress has been made. You can sometimes recover detail in shadows if theres enough data there in post-processing, but you cant remove glare in post-processing, and the removal of glare adds vibrancy, contrast and reveals details thatare otherwiseunseen.

When you rotate acircular polarizer you will see it turnON and OFF through the viewfinder, allowing you to control the amount of polarization necessary for your shooting situation. The higher in elevation you shoot, the more pronounced the polarization, and the more dynamic range is increased as a result.

Design

A winning designproven byoutdoorphotographers.

Breakthrough Photographytook all theylearned from the success of the X3 ND and designed an entirely new circular polarizing frame, unlike youve ever seen before. And like the X3 ND, Breakthrough Photographyspecifically designed the X4CPL as a workhorse CPL for field work, built to withstand extreme wind, salt water, dust and other abrasive conditions and elements where other filters may fail. And Breakthrough Photographyguarantees each and every X4CPL to perform with optimal optical clarity and color neutrality for 25 years even in the harshest of conditions.

Worlds sharpest CPL filter. Guaranteed.

The X4CPLfeatures SCHOTT Superwhite B270 optical glass, which is an ultra clear crown glass. It is produced by melting high purity raw materials and then made using the continuous draw process. The result is excellent transmission in the ultraviolet, visible, and infrared spectrums, and a high surface quality that accepts our state-of-the-art MRC and nanotec coatings exceptionally well.

Thestate-of-the-art multi-resistant coating (MRC) is an optical coating applied to both surfaces of the glass disk to reduce reflection and to increase surface durability. Breakthrough Photography’sproprietary MRC coating is structurally harder than the glass itself and the reduced reflections improve the efficiency since less light is lost. The reduction of reflections also improves the contrast of the image by elimination of stray light.The real world result? Better contrast and color.

Low light transmission and green flaring are common problems with uncoated glass. AsMRC coatings are added to each side of the optical disk light transmission steadily increases with flaring steadily decreasing. In the lab tests light transmission apexes at about 16-layers of MRC, and slowly decreasing in transmission at 18 and above.8-layers of MRC are applied evenly to both sides of each optical disk resulting in MRC16.