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The Heliopan 67mm #25 Light Red Filter is a basic contrast filter, primarily for use with black and white film, that completely absorbs blue and green tones, enhances reds, and increases contrast for outdoor photography. It also helps to cut through atmospheric haze and is suitable for infrared photography. There is an approximate 8x filter factor with this filter, requiring an increase of 3 stops for normal exposure.
The front and rear surfaces of the filter both feature a single anti-reflection coating. Each coating helps to increase light transmission by reducing reflections, scattered light, and ghosting. Additionally, they offer protection to the filter substrate while helping to keep the glass clean for longer than uncoated glass.
This Heliopan filter is constructed from Schott glass for increased optical clarity and color fidelity. It features a brass filter ring for durability as well as jamming prevention.
Light red contrast filter for black and white film significantly darkens blue and green tones, cuts through haze, and increases overall contrast.
Commonly used for landscape photography to emphasize blue skies and give clouds more visual depth. Also suitable for infrared photography.
Single coatings on both the front and rear offer protection to the glass and help to improve light transmission and image quality.
Constructed from Schott glass for optical clarity.
Brass filter ring helps to prevent jamming and provides additional strength.
Dual threading with 67mm front filter threads permits combining with other filters.