Lens Filter TIAN-YA FADER 40.5mm — variable density photographic filter

The TIAN-YA FADER 40.5mm variable density photographic filter is a screw-in neutral density solution for lenses with a 40.5 mm filter thread. It provides continuously adjustable light reduction so photographers can control exposure without changing aperture or ISO. The filter is intended to help achieve longer shutter speeds for motion blur, wider apertures in bright light, or controlled exposure in variable lighting conditions while maintaining optical clarity.

Advantages

The variable neutral density design allows smooth adjustment of light attenuation across a range of stops using a single threaded element that mounts directly to the lens. Because it is screw-in, the filter keeps the optical axis aligned and minimizes vignetting on compatible lenses of matching thread size. The filter enables practical control of exposure for landscape, long-exposure and creative photography, reducing the need for exposure compensation or multiple fixed-density filters.

Suitable for

• Landscape and outdoor photography requiring controlled exposure
• Long-exposure shots to smooth water and capture motion blur
• Using wider apertures in bright conditions for shallow depth of field
• Video work where gradual reduction of light is needed without changing camera settings

Key specifications

• Filter type: variable neutral density (FADER)
• Mount: screw-in thread designed for 40.5 mm lens threads
• Optical function: continuous light attenuation to allow longer exposures or wider apertures
• Form factor: slim circular filter to reduce risk of vignetting on compatible lenses
• Material: optical-grade glass elements (treated to preserve image quality)

How to use

Screw the TIAN-YA FADER 40.5mm onto the front of a lens with a 40.5 mm filter thread until secure. Rotate the outer ring to adjust the density and observe the exposure change in the camera’s viewfinder or live view. For long exposures, compose and focus before applying very dark settings to avoid difficulty focusing; then switch to manual focus if necessary. When using wide apertures in bright light, adjust the filter until the desired shutter speed and aperture combination is achieved.

Usage recommendations

Check for cross-polarization effects or color cast at extreme density settings and correct in-camera white balance or post-processing if needed. To minimize reflections and maintain contrast, use the filter with lenses that match the 40.5 mm thread and avoid stacking multiple filters unless required.