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37mm round glass filter with black rim

B + W Filter Company

B + W 37mm Master 803M ND 0.9 3-Stop MRC Nano Neutral Density Filter

SKU CH-XPCW-88B1G

A 37 mm neutral-density filter that cuts light by three stops for wider apertures or longer exposures, with multi-layer anti-reflective coating on German-made glass

  • Three-stop light reduction enables wider apertures in bright conditions
  • 9 density creates silky water and motion-blur effects
  • Multi-layer anti-reflective coating cuts glare for crisp images
  • Brass ring and Schott glass maintain optical quality on high-end lenses
  • Suitable for both analogue and digital camera systems

37mm Master 803M ND Filter

The B + W Master 803M is a 37mm neutral density filter that reduces light transmission by three stops with a density of 0.9. It is built for photographers and videographers who need to control exposure in bright conditions without changing aperture or shutter speed. German-made optical glass with multi-layer coating preserves image clarity.

Creative shooters needing motion blur

This filter suits users who want silky water effects, light trails, or shallow depth of field in daylight. It works with both analog and digital cameras accepting 37mm threads. Photographers requiring variable density, stronger light reduction, or a different thread size should look at other options.

Fixed 3-stop density (0.9)

The single specification that decides fit is the fixed optical density of 0.9, which equals exactly three f-stops of light reduction. This set value determines whether the filter matches the exposure control needed for a specific scene or lens combination.

Highlights

  • Three-stop light reduction enables wider apertures in bright conditions
  • 9 density creates silky water and motion-blur effects
  • Multi-layer anti-reflective coating cuts glare for crisp images
  • Brass ring and Schott glass maintain optical quality on high-end lenses
  • Suitable for both analogue and digital camera systems

Specifications

No published specifications for this item yet.

Questions about this item

How much light does the 0.9 density cut in practice?

The filter reduces exposure by three full f-stops, letting you open the aperture or slow the shutter without overexposing the frame.

What does the MRC Nano coating actually stop?

Seven anti-reflective layers on each side suppress flare and ghosting while keeping colour neutral across the frame.

Will the 37 mm thread fit my lens without vignetting?

The slim brass mount screws onto any 37 mm front thread and stays thin enough to avoid corner shading on wide angles.

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