Neutral Density Adjustable Filter K&F 40.5 mm with Fader ND8–ND128 (KF01.1444)

The Neutral Density Adjustable Filter K&F 40.5 mm with Fader ND8–ND128 provides variable light attenuation for lenses with a 40.5 mm filter thread. This fader-style ND filter continuously adjusts light reduction from approximately 3 stops (ND8) up to 7 stops (ND128), enabling precise control of exposure and motion blur without changing filters. It is intended for use in bright conditions where extended shutter speeds, wider apertures, or smoother video shutter control are required.

Advantages

The fader design offers continuous adjustment between ND8 and ND128, allowing gradual changes in light reduction without interrupting a shoot. Its 40.5 mm sizing ensures compatibility with lenses that use this standard thread, and the circular screw-in format keeps the front profile compact and easy to mount. By reducing the need to swap filters, the adjustable ND improves workflow efficiency for photographers and videographers working outdoors.

Suitable for

• Daylight long exposure photography of landscapes, waterfalls, and seascapes
• Portraits or scenes requiring wider apertures in bright light
• Handheld or tripod-based video to control shutter exposure and achieve cinematic motion
• On-location shoots where quick, fine-tuned exposure adjustments are needed

Key specifications

• Filter type: Variable neutral density (fader) filter
• Light reduction range: ND8 to ND128 (approx. 3 to 7 stops)
• Mount: 40.5 mm screw-in (circular)
• Control: Continuous rotation fader for smooth adjustment
• Primary use: Exposure and motion blur control for photo and video

How to use

Screw the filter onto the lens front thread until it seats securely without cross-threading. Rotate the outer ring to adjust the density gradually from ND8 to ND128 while monitoring the exposure in the viewfinder or on the camera display. For long exposures, use a tripod to prevent camera shake and set the camera to manual or shutter-priority mode to lock in desired shutter speed. For video, adjust the fader while checking shutter angle or shutter speed to maintain consistent motion rendition. If you notice vignetting at wide focal lengths, confirm the filter is correctly seated and consider stopping down or using a wider-angle-specific solution.

Usage recommendations

Test the full adjustment range before critical shoots to identify any color cast or desired exposure limits. Use light metering or histograms to confirm results and re-check focus after heavy density settings. Store the filter in its protective case when not in use to avoid scratches and dust on the glass surfaces.