World’s Sharpest ND Filter. 100% Guaranteed.

The X4 ND features 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.

• Nanotec Coating repels dirt, water and other elements
• Schott B270 Ultrawhite Optical Glass with MRC16 (multi resistant 16-layer coating)
• Brass construction traction frame
• Made in the USA with German Glass
• Light Loss Factor: 15-Stop

MRC16 Coating

Breakthrough’s state-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’s proprietary 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. As MRC coatings are added to each side of the optical disk light transmission steadily increases with flaring steadily decreasing. In our 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.

Worlds Most Color Neutral ND Filter. 100% Guaranteed.

Most of the neutral density filters on the market exhibit a strong blue or magenta cast. The higher the ND factor the more pronounced the color cast. To achieve the most color neutral ND performance,Breakthrough developedan alternative manufacturing method to the conventional oven process.

A breakthrough design with traction.

Constructed of high quality brass CNC machined with Breakthrough’s signature traction frame, the X4 ND is easier than ever to attach and remove securely, even with gloves on in cold conditions. The X4 ND is specifically designed be a workhorse ND filter for field work, built to withstand extreme wind, salt water, dust and other abrasive conditions and elements.

Breakthrough Photography stands behind every filter they make with their 25 Year Ironclad Guarantee. Every filter has a unique serial number laser engraved onto the interior frame. When you activate your 25 Year Ironclad Guarantee, this serial number is assigned to you. Visit https://breakthrough.photography/pages/activate to activate your filter warranty.

After activation, and in the event you ever need to contact Breakthrough Photography for support, you don’t need your purchase information or receipt ever again. This also allows Breakthrough Photography to confirm non-genuine copies, and any feedback or insight you provide goes directly into future products.