Thank you for viewing. I am selling this item to organize my equipment. KANI Light Pollution Reduction Filter 100x100mm This is a light pollution reduction filter that cuts color casts caused by light pollution (effects of light sources in urban areas, such as sodium lamps and mercury lamps). I have used it a few times at an indoor observation deck, and it seems to be in good condition. However, since it is a used item, please refrain from purchasing if you are looking for a perfect condition or if you are sensitive to the condition. (For Search) kani filter kani filter square filter nightscape photography