B + W 40.5mm #091 Multi Coated Glass Filter - Dark Red #29
• The use of this filter gives a surrealistic effect in landscape and architectural photography by producing a "storm-like" cloud effect, "moonlight" effect, and "wood" effect.
• It is indispensable for tonal separation in still-life photography and for the reproduction of documents which have become illegible.
• Filter factor is approx. 8.