TIAN-YA Adjustable Variable ND Filter K&F Concept B-Series Fader ND02-400 — 55 mm

The TIAN-YA Adjustable Variable ND Filter K&F Concept B-Series Fader ND02-400 — 55 mm is a screw-on neutral density filter designed to give photographers continuous control over light transmission. With an adjustable attenuation range equivalent to ND02–ND400, this 55 mm filter lets you reduce incoming light to achieve longer exposures or wider apertures in bright scenes without changing ISO. It is intended for use on lenses with 55 mm front threads and supports creative techniques such as motion blur, smoothing water, and controlling depth of field in daylight.

Advantages

This variable ND filter provides a wide and stepless density range allowing precise exposure control from slight to strong light reduction. Its screw-on 55 mm mount ensures a secure fit to compatible lenses, and the fader design enables quick adjustments without swapping filters. By enabling slower shutter speeds and wider apertures under bright conditions, the filter supports both technical control and creative effects without requiring complex setup changes.

Suitable for

• Landscape photography where long exposures are used to smooth water and cloud motion
• Long-exposure and motion-blur effects during daytime shooting
• Controlling depth of field for portraits or scene composition in bright light
• Video capture that requires reduced exposure and shallower depth of field

When it may not be suitable

Variable ND filters can introduce cross-polarization effects, vignetting, or uneven color cast at extreme density settings, especially when stacked with other filters or used on very wide-angle lenses. For the most demanding optical quality or for very high attenuation uniformity, a fixed single-stop ND filter or a high-quality multi-stop filter may be preferable.

Key specifications

• Mount diameter: 55 mm screw-on
• Density range: adjustable from ND02 to ND400 (stepless variable attenuation)
• Function: neutral density (variable) for exposure control and creative long exposures

How to use

Screw the 55 mm filter gently onto the front threads of a compatible lens until it seats securely without overtightening. Rotate the outer ring to adjust the density level and monitor exposure using the camera meter or histogram. Use lower density settings for subtle light reduction and higher settings for long exposures or pronounced motion blur. When composing with wide-angle lenses, check for vignetting and avoid stacking additional filters unless necessary. After use, remove the filter and store it in a protective case to prevent scratches.

What to consider before purchase

• Confirm that your lens has a 55 mm front thread to ensure compatibility
• Consider whether a variable ND or fixed-stop ND better suits your optical quality needs
• Be aware that extreme settings may affect image uniformity or color balance on some lenses

Usage recommendations

For best results, combine moderate density settings with a tripod and low ISO to minimize noise during long exposures. Test the filter at different densities and focal lengths to identify any color shift or vignetting with your lens, and use white balance adjustments in-camera or in post-processing when needed.