Neutral density camera filter Hoya NDx400 52mm

The Hoya NDx400 52mm neutral density camera filter provides a 9-stop light reduction (approx. ND optical density 2.7) to limit the amount of light entering the lens. This allows for longer exposure times or wider apertures in bright conditions while preserving image characteristics. The filter is made from optical glass with a black finish and features Hoya's HMC (Hoya Multi Coated) surface treatment to maintain high transmission and reduce reflections.

Advantages

The NDx400 offers a consistent 9-stop attenuation for predictable exposure control and creative effects such as motion blur and smooth water. Hoya HMC multi-coating minimises surface reflections, reducing flare and ghosting while maintaining an average light transmission above 97% for balanced colours and sharp contrast. The 52mm thread size fits lenses with corresponding filter threads.

Suitable for

• Landscape photography to create smooth water and motion effects
• Long-exposure daylight photography
• Scenes requiring wider apertures in bright light
• Creative motion blur of clouds, crowds, or vehicles

Key specifications

• Filter type: Neutral Density (NDx400)
• Light reduction: 9 stops (approx. ND optical density 2.7)
• Diameter: 52 mm
• Coating: Hoya Multi Coated (HMC)
• Average light transmission: over 97% (with HMC)
• Material: optical glass
• Brand: Hoya
• EAN: 024066018069

How to use

Screw the filter onto the front of a lens with a 52 mm filter thread. Compose and meter the scene as usual; then adjust exposure to account for the 9-stop reduction—either by using a longer shutter speed or by opening the aperture. For precise exposure, use manual mode or exposure compensation and test shots. When using very long exposures, mount the camera on a tripod and use a remote release or timer to avoid camera shake.

Usage recommendations

Keep the filter clean and store it in its case when not in use. Check focus and white balance after attaching the filter; if necessary, perform a custom white balance to correct minor colour shifts. Avoid stacking thick filters that may vignette on wide-angle lenses.