K&F Concept X-PRO Square Light Pollution Filter 100 × 100 mm with Protective Frame

A square light pollution filter for the K&F Concept X-PRO holder that suppresses the yellow light of street lamps flooding the night sky in and around towns. Stars and the Milky Way stand out from the orange haze and night cityscapes get more natural colours. The 2 mm AGC glass with 36 coating layers sits in a protective frame.

A night sky without the yellow haze

The filter cuts the wavelengths emitted by common street lamps and so removes the yellow cast from night shots. In astrophotography this raises the contrast of stars and the Milky Way; in night cityscapes colours come closer to reality instead of looking burnt orange.

Protective frame

The glass sits in a protective frame by which the filter is handled and slid into the holder, so no fingerprints reach the glass surface. The frame also protects the glass in a fall: dropped from 1.5 m onto flat ground the filter does not break (it cannot protect against a fall onto a sharp edge). The frame design won the iF Design Award and Red Dot 2021.

Glass and coating

The Japanese AGC optical glass is polished on both sides and carries 36 layers of nano coating with 0.15% reflectance. The coating suppresses flare and ghosting, repels water and grease and resists scratches.

For the X-PRO system

The filter is made exclusively for the K&F Concept X-PRO square filter holder; in its frame it does not fit holders of other brands.

Pouch

The filter is stored in a PU leather pouch with a pull tab that slides it out without touching the glass.