Neutral density camera filter Hoya NDx400 72mm

The Hoya NDx400 72mm neutral density camera filter reduces incoming light by 9 stops (approximate optical density 2.7), enabling longer exposures or wider apertures in bright conditions without altering image colours. Made from high-quality optical glass with a black frame, the filter is compatible with lenses that accept 72mm threads and is supplied as a single unit.

Advantages

The NDx400 provides a strong, consistent light reduction that makes it possible to achieve motion blur and extended exposure effects in daylight. Hoya's HMC (Hoya Multi Coated) treatment minimises surface reflections, reducing flare and ghosting while maintaining an average transmission above 97% for accurate contrast and balanced colour reproduction. The robust optical glass and precisely machined frame ensure stable performance and minimal colour cast.

Suitable for

• Landscape photography to smooth water and clouds
• Long exposure architecture and urban scenes
• Creative motion blur in bright daylight
• Use with lenses that have 72mm filter threads

Key specifications

• Filter type: Neutral Density (ND)
• Model: Hoya NDx400
• Light reduction: 9 stops (approx. ND 2.7)
• Size: 72 mm filter thread
• Coating: HMC (Hoya Multi Coated)
• Material: Optical glass with metal frame
• Pack: Single unit

How to use

Screw the filter onto a lens with a 72mm filter thread before composing the shot. For long exposures, use a tripod and enable mirror lock-up or electronic front-curtain shutter if available to reduce vibration. Adjust exposure using the camera's manual or shutter-priority modes and verify results with histograms or test exposures; the filter cuts light by approximately nine stops so significantly longer shutter speeds or wider apertures are required compared with shooting without the filter.

Usage recommendations

When using the NDx400 for very long exposures, check for vignetting with wide-angle lenses and use live view or test shots to confirm white balance; consider shooting in RAW to correct any minor colour shifts in post-processing.