Neutral Density (ND) Variable Filter K&F 77mm Fader ND8–ND2000 model SB6581

Neutral Density (ND) Variable Filter K&F 77mm Fader ND8–ND2000 model SB6581 is a variable ND filter designed for lenses with 77 mm front threads. The filter provides adjustable light reduction from approximately 3 stops (ND8) to about 11 stops (ND2000), enabling longer exposures and wider aperture usage in bright light without changing the scene's color balance. The screw-in design mounts directly to compatible lenses and is intended for landscape, long-exposure, and motion-blur photography.

Advantages

The variable density range allows gradual control of exposure without swapping multiple fixed ND filters, and the filter’s neutral transmission minimizes color cast. Its threaded mounting ensures a secure attachment to 77 mm lenses, while the adjustable mechanism offers precise control over light reduction for both stills and video. The filter preserves image sharpness and enables creative effects such as motion blur and slower shutter speeds in bright conditions.

Suitable for

• Landscape photography requiring long exposures
• Long-exposure seascapes and waterfalls
• Motion blur effects for vehicles, crowds, or flowing water
• Video shooting in bright conditions where controlled exposure is needed

Key specifications

• Filter type: Variable neutral density (ND)
• Mount thread size: 77 mm
• Density range: ND8 to ND2000 (approx. 3 to 11 stops)
• Optical effect: Adjustable light transmission with neutral color balance
• Construction: Screw-in circular filter, multi-element glass coating to reduce reflections

How to use

Attach the filter by screwing it onto the 77 mm front threads of a compatible lens until secure. Rotate the outer ring to adjust the density gradually, observing the exposure through the viewfinder or live view; for longer shutter speeds, increase density until the desired exposure is reached. When using the filter at extreme densities, check for potential vignetting on wide-angle lenses and adjust composition or use a thinner filter if necessary. For video, set exposure parameters first and fine-tune density to maintain consistent shutter speed and aperture.

Usage recommendations

Use the filter with a tripod for long-exposure shots to avoid camera shake. Monitor white balance if precise color reproduction is critical and bracket exposures when testing new density settings. Store the filter in a protective case when not in use to avoid scratches and dust on the optical surfaces.