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B+W 40.5mm Master 803M ND 0.9 3-stop neutral density filter, slim metal ring, clear glass

B + W Filter Company

B + W Filter Company 40.5mm Master 803M ND 0.9 3-Stop MRC Nano Neutral Density Filter

SKU CH-5C9T-RA1R2

A 40.5mm neutral density filter that cuts light by three stops for wider apertures or longer exposures, with a seven-layer anti-reflective coating on each side to maintain contrast and clarity

  • Reduces light by three stops with 0.9 density
  • Multi-layer anti-reflective coating cuts glare on both sides
  • Enables wider apertures for shallow depth of field
  • Creates smooth motion effects in water and clouds
  • Made in Germany from polished optical glass

40.5mm ND 0.9 filter for exposure control

This 40.5mm Master 803M neutral density filter reduces light by three stops, giving photographers and videographers precise exposure management in bright conditions. It suits both analog and digital cameras, preserving the optical quality of high-end lenses with finely ground special glass. The multi-layer anti-reflective coating on each side minimises reflections and glare for enhanced contrast and clarity.

Replaces guesswork with measured light reduction

The filter upgrades exposure control by providing a consistent 0.9 density value instead of relying on variable aperture or shutter adjustments alone. The jump is worth it when bright ambient light forces unwanted depth of field or when motion-blur effects demand longer shutter speeds than the scene allows. It enables selective sharpness through wider apertures and creates cotton-candy water or empty-street effects without overexposure.

Sustains optical neutrality during long exposures

Under continuous bright light the coating maintains consistent density and colour fidelity, preventing the contrast loss that can accumulate during extended shutter times. The seven-layer coating per side resists flare buildup when the sun hits the front element directly. The German-made glass retains flatness so that sharpness stays uniform from the centre to the edges throughout the exposure.

Highlights

  • Reduces light by three stops with 0.9 density
  • Multi-layer anti-reflective coating cuts glare on both sides
  • Enables wider apertures for shallow depth of field
  • Creates smooth motion effects in water and clouds
  • Made in Germany from polished optical glass

Specifications

No published specifications for this item yet.

Questions about this item

What thread size does the 40.5mm Master 803M ND 0.9 filter require on my lens?

The filter mounts directly onto any lens with a 40.5 mm front thread; no step-up or step-down rings are needed if your lens matches that diameter.

How do I install the Master 803M ND filter without trapping dust or causing vignetting?

Clean both the lens front element and the filter glass, then screw the filter on gently until snug — avoid over-tightening, which is the common mistake that makes removal difficult later.

Will the MRC Nano coating on the 803M ND filter degrade and need replacement?

The seven-layer multi-resistant coating per side is durable; it does not wear out under normal use, so the filter itself does not require scheduled replacement — only occasional cleaning with a microfibre cloth.

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