Neutral Density Variable Filter K&F Concept 55 mm ND2–ND2000 (Variable ND, adjustable, gray)

The Neutral Density Variable Filter K&F Concept 55 mm ND2–ND2000 is an adjustable gray (neutral) filter designed for lenses with a 55 mm filter thread. It provides a continuously variable light reduction ranging approximately from ND2 to ND2000, enabling precise control of exposure time and depth of field without changing aperture or ISO. The neutral gray construction aims to minimise color cast, making this variable ND suitable for landscape photography, long exposures, and video work where controlled light reduction and natural color reproduction are important.

Advantages

This variable ND filter offers a wide adjustable range for fine control over light attenuation, allowing both subtle and very strong reductions in exposure. The screw-in 55 mm mount makes attachment straightforward on compatible lenses, while the neutral gray design reduces the likelihood of noticeable colour shifts. The single compact filter replaces multiple fixed-density filters, reducing kit weight and increasing versatility in changing light conditions.

Suitable for

• Landscape photography with long exposures to smooth water and clouds
• Portrait or outdoor shooting to use wider apertures in bright light
• Videography to control shutter exposure for consistent motion rendering
• Street and travel photography where quick exposure adjustment is needed

Key specifications

• Filter type: Variable neutral density (variable ND)
• Filter thread size: 55 mm
• Density range: approximately ND2 to ND2000 (continuous adjustment)
• Optical colour: neutral gray for minimal colour shift
• Mount style: screw-in metal ring compatible with 55 mm threaded lenses
• Primary use: exposure control for stills and video, long exposures

How to use

Screw the filter onto a lens with a 55 mm filter thread until secure, taking care not to cross-thread. Rotate the outer ring to adjust the density gradually; observe the light meter or histogram and adjust exposure settings (shutter speed, aperture, ISO) as needed for the intended effect. For long-exposure landscape shots, set a small aperture and low ISO, then rotate the filter to reach the desired shutter speed. For video, adjust the ND to maintain correct exposure while keeping the preferred shutter angle or shutter speed.

Usage recommendations

Use live view or a test exposure to verify colour neutrality and avoid unwanted vignetting at wide-angle settings. When working at extreme densities, check for potential cross-polarisation or X-pattern (common with some variable NDs) and compensate by changing composition, reducing stacked filters, or switching to a fixed ND if necessary.