Neutral Density Variable Filter K&F 49mm Adjustable ND8–ND128 (KF01.1454)

The Neutral Density Variable Filter K&F 49mm Adjustable ND8–ND128 reduces the amount of light entering the lens to allow longer exposures, wider apertures in bright conditions and better control of motion blur. With a 49mm thread size it fits lenses with the same filter thread and provides continuous attenuation from approximately 3 stops (ND8) up to 7 stops (ND128). The filter is intended for photographers and videographers who need flexible exposure control without changing fixed-density filters.

Advantages

The variable ND design offers smooth and continuous light reduction across the ND8–ND128 range, eliminating the need to carry multiple individual neutral density filters. Constructed with multi-coated glass elements, it minimizes reflections and helps retain color fidelity and contrast. The 49mm screw mount ensures compatibility with many compact lenses and lightweight systems, while the slim optical frame reduces vignetting on wide-angle lenses.

Suitable for

• Landscape photography requiring long exposures for smooth water and cloud motion
• Portraits or outdoor scenes where wider apertures are desired in bright light
• Video shooting to maintain consistent shutter settings and cinematic motion blur
• Tripod-based long-exposure cityscape and night photography

Key specifications

• Filter type: Variable neutral density
• Thread size: 49 mm
• Light reduction range: approximately ND8 to ND128 (≈3 to 7 stops)
• Optical construction: multi-coated glass elements
• Frame: slim profile to reduce vignetting on wide-angle lenses

How to use

Screw the filter onto the front filter thread of a lens with a 49mm diameter until it seats securely without overtightening. Rotate the front ring to adjust the density and observe changes in the viewfinder or live view to reach the desired exposure. For long exposures, mount the camera on a tripod and use mirror lockup or electronic shutter where available to reduce vibration. When shooting video, set exposure parameters first and then fine-tune the filter to achieve the target shutter speed and motion rendering.

Usage recommendations

To avoid cross-polarisation or unwanted X-patterns at extreme settings, avoid combining maximum density with very wide-angle lenses; if patterns appear, reduce the rotation slightly or use a single fixed ND filter. Store the filter in a protective case when not in use and clean the glass with a soft microfiber cloth and lens-safe cleaner to maintain optical performance.