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The 37 #25 Light Red Filter from Heliopan is designed to build strong contrast in black and white photography. The filter will make skies look more dramatic and give a tonal difference between foliage and the flowers. Infrared images can also be enhanced by the filter giving a moonlight effect. The color blue and green are completely absorbed, which will make them darker and increasingly show more contrast. The red color will even cut and remove haze from a black and white image. Exposures should be increased by 3 stops, because of the 8x filter factor.
The ring is made from brass, which will prevent it from getting stuck on the front thread of a lens because of the pliable nature of the metal. The brass ring also has front threads, so filter stacking is possible. Schott Glass is a high grade of glass that is used for all Heliopan filters.
Increases contrast in black and white film and darkens blue and green tones. Suitable for infrared photography and cuts through haze.
Constructed from Schott Glass
Brass filter ring prevents filter getting stuck on the front thread of the lens
Dual threading with 37mm front filter threads allows filter stacking