Neutral density camera filter B+W 803 MASTER, 39 mm, Multi Resistant Coating (MRC)

B+W 803 MASTER neutral density camera filter, 39 mm thread, reduces incoming light by three f-stops to enable longer exposures and wider aperture use on compact and mirrorless lenses with 39 mm filters. The filter glass is finely ground and polished to preserve optical quality and avoid degrading lens performance. A multi-layer thin-film coating combines a neutral density function with a seven-layer anti-reflective system on each side and a final dirt- and water-repellent outer layer, providing consistent color-neutral light attenuation, improved scratch and reflection resistance, and easier cleaning and maintenance.

Advantages

The B+W 803 MASTER ND filter offers uniform light reduction across the visible spectrum, delivering color-neutral results while preserving the optical characteristics of high-quality lenses. Multi Resistant Coating (MRC) adds multi-layer anti-reflection protection and an outer hydrophobic, dirt-repellent layer for reduced reflections, enhanced scratch resistance, and simplified cleaning. Its 39 mm slim construction is suitable for compact and mirrorless setups without adding significant bulk.

Suitable for

• Landscape photography with extended exposures
• Creating motion blur effects in water, clouds, or traffic
• Video shooting in bright conditions when aperture cannot be reduced
• Portraits or shallow depth-of-field looks in bright light using wider apertures

Key specifications

• Filter type: Neutral density (ND), 0.9 (reduces light by 3 f-stops)
• Thread size: 39 mm
• Glass: Finely ground and polished optical glass
• Coating: Multi Resistant Coating (MRC) with seven anti-reflective layers per side and hydrophobic outer layer
• Optical properties: Uniform attenuation across visible range, color-neutral transmission
• Construction: Slim profile suitable for compact and mirrorless lenses

How to use

Screw the 39 mm B+W 803 MASTER ND filter onto the front thread of a compatible lens until it is secure but not overtightened. If stacking with other filters, check for vignetting on wide-angle lenses. Meter exposure or use exposure compensation to account for the three-stop reduction in light; when shooting video maintain shutter speed consistent with desired motion rendering while using the filter to control exposure. Clean the outer coating with a microfiber cloth and suitable lens cleaner if required.

Usage recommendations

For long-exposure landscape or water-flow effects, use a tripod and remote release to prevent camera shake and increase exposure time as needed. When composing in bright conditions, preview depth of field and exposure with the filter attached and adjust ISO or shutter speed to maintain desired image brightness and motion rendering. Avoid excessive torque when mounting and store the filter in a protective case to preserve the MRC coating.