Neutral Density Variable Filter K&F CONCEPT 67 mm (ND2–ND2000) Gray, Adjustable, Nano-C Coating

The Neutral Density Variable Filter K&F CONCEPT 67 mm (ND2–ND2000) is an adjustable gray filter designed for lenses with a 67 mm thread. The filter provides continuous light reduction from ND2 up to ND2000, allowing precise control of exposure for long-exposure photography, motion blur effects and maintaining wider apertures in bright conditions. The glass features a Nano-C coating to reduce reflections and preserve color neutrality across the visible spectrum.

Advantages

This variable ND filter offers a wide density range in a single unit, removing the need to carry multiple fixed filters. The gray neutral density characteristic reduces light evenly to prevent color casts, while the Nano-C coating improves transmission consistency, lowers surface reflections and increases scratch and water resistance. The slim-profile frame helps reduce vignetting on wide-angle lenses and the threaded design ensures secure mounting on any lens with a 67 mm filter thread.

Suitable for

• Long-exposure landscape photography to smooth water and cloud motion
• Creating motion blur in moving subjects such as traffic or waterfalls
• Using wide apertures in bright daylight to control depth of field
• Time-lapse and video work requiring consistent exposure control
• Architectural and urban photography where controlled exposure is needed

Key specifications

• Filter type: Variable neutral density (gray)
• Density range: Adjustable from ND2 to ND2000
• Mount size: 67 mm screw thread
• Optical material: Coated optical glass
• Coating: Nano-C anti-reflective and protective coating
• Frame design: Slim profile to reduce vignetting

How to use

Attach the filter to the front of a lens with a 67 mm filter thread by screwing it on until secure. Rotate the outer ring to adjust the density continuously between ND2 and ND2000 while observing exposure changes in the viewfinder or on the camera display. For precise long exposures, determine the base exposure without the filter, then apply the calculated exposure compensation for the chosen ND setting. When using wide-angle lenses, check for vignetting at extreme wide focal lengths and adjust the composition or use a thinner filter frame if necessary.

Usage recommendations

To minimise X-pattern cross-polarisation and uneven darkening at high densities, avoid stacking another polarizer directly on the variable ND. Clean the coated glass with a soft microfiber cloth and use gentle, alcohol-free lens cleaner when needed. Store the filter in a protective case to preserve the Nano-C coating and prevent scratches.