K&F Neutral Density Variable Filter 58mm Fader ND2–ND400 Gray (model SB7794)

The K&F Neutral Density Variable Filter 58mm Fader ND2–ND400 Gray is a precision optical accessory for lenses with a 58mm filter thread. This variable ND filter provides continuously adjustable light reduction from approximately 1 to 9 stops (ND2 to ND400), allowing controlled suppression of light reaching the sensor without changing aperture or shutter settings. The slim profile and solid mounting ring are designed for stable fit on compatible lenses, making it practical for landscape photography, long-exposure work, and video applications where flexible control of exposure and motion blur is needed.

Advantages

The variable design replaces multiple fixed-density filters and enables fine-grained adjustment of exposure and depth of field while keeping composition unchanged. Neutral gray glass minimizes color cast and preserves natural color balance across exposure settings. The filter’s low-profile frame reduces vignetting on wide-angle lenses and the threaded mount ensures a secure, repeatable attachment to lenses with a 58mm thread.

Suitable for

• Landscape and nature long-exposure photography
• Controlled motion blur for waterfalls, rivers, and clouds
• Video shooting requiring variable light attenuation
• Using wider apertures in bright light for shallow depth of field

Key specifications

• Filter type: Variable neutral density (Fader) gray
• Thread size: 58 mm
• Light reduction range: ND2 to ND400 (approximately 1 to 9 stops)
• Frame: low-profile metal frame to reduce vignetting
• Optical material: neutral density glass designed to minimize color shift

How to use

Attach the filter to the front of a lens with a 58mm thread and rotate the outer ring to change the density. Start with the filter set to minimal density and gradually increase attenuation while observing exposure and composition through the viewfinder or live view. For long exposures, combine the filter setting with a tripod and mirror lockup or electronic shutter where available to reduce camera shake. When recording video, adjust the density smoothly to avoid abrupt exposure changes; use camera exposure compensation or manual exposure settings as needed.

Usage recommendations

To avoid cross-polarization “X” pattern at extreme settings, avoid combining this variable ND at maximum density with additional stacked filters or extreme wide-angle settings. Check for any color cast and correct in-camera white balance or in post-processing if necessary. Store the filter in a protective pouch when not in use to keep the optical surfaces free of dust and scratches.