Neutral density camera filter B+W 802 Master, size 3.9 cm, MRC coating

B+W 802 Master neutral density camera filter, 3.9 cm diameter, with Multi Resistant Coating (MRC) provides consistent light reduction without altering color balance. Made from finely ground, polished special optical glass, the filter maintains high image quality and avoids introducing optical defects when used with high-quality lenses. The thin-film coating delivers the neutral density effect while combining a multi-layer anti-reflective system and an outer dirt- and water-repellent layer for easier maintenance and reduced reflections.

Advantages

The filter offers a uniform attenuation of visible light across the spectrum, producing color-neutral results and preserving contrast. Its multi-layer anti-reflective coating reduces stray reflections and flare, while the outer repellent layer simplifies cleaning and resists fingerprints, dust and moisture. The compact 3.9 cm size and single-piece pack make it convenient to carry and integrate into a photographer’s kit without adding significant bulk.

Suitable for

• Landscape photography requiring long exposures to smooth water and clouds
• Portraits where wider apertures are used for shallow depth of field in bright conditions
• Architectural and cityscape shots needing controlled exposure in mixed lighting
• Creative long-exposure effects with moving subjects such as waterfalls or traffic

Key specifications

• Filter type: neutral density (ND) providing approximately 2 f-stop light reduction
• Glass: finely ground, polished optical special glass for high image quality
• Coating: multi-layer anti-reflective coating on both sides (seven layers per side)
• Surface finish: outer dirt- and water-repellent protective layer for easier cleaning
• Optical characteristic: color-neutral attenuation across the visible spectrum
• Size: 3.9 cm diameter, slim profile suitable for compact filter holders or mounting

How to use

Mount the B+W 802 Master neutral density filter securely to the front of a compatible lens using the appropriate holder or adapter for the 3.9 cm diameter. Compose and focus the scene before attaching the filter when using manual focus or focus-priority autofocus to ensure sharp results, since the ND effect reduces light entering the viewfinder or sensor. Adjust exposure settings to account for the approximate 2-stop reduction in light: choose wider apertures for shallower depth of field or longer shutter speeds for motion blur effects. When working in low-light situations or for very long exposures, use a tripod and a remote release or camera timer to avoid camera shake.

Usage recommendations

For best optical performance, keep the filter clean and store it in a protective case when not in use. Clean with a soft microfiber cloth and approved lens cleaning solution, avoiding harsh chemicals or abrasive materials. Verify exposure changes with the camera’s meter and test a few shots after mounting the filter to confirm white balance and histogram distribution remain as expected; apply minor exposure or color adjustments in post-processing only if necessary.