black, suitable for Color-Skopar Pancake II 2.5/35 mm VM, Ultron 2.0/35 mm Type I VM, Nokton Vintage Line 1.5/35 mm aspherical Type I VM and Nokton Vintage Line 1.5/35 mm aspherical Type II VM lenses

Improve the image quality of photos in certain lighting situations and reduce stray light and lens flare.