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Heliopan 30.5mm Dark Yellow Filter (15) from

Heliopan 30.5mm Dark Yellow Filter (15)

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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.

The Heliopan 30.5mm Dark Yellow Filter is a basic contrast filter, primarily for use with black and white film, that very strongly darkens skies and blues, cuts through haze, increases contrast, and is often used for outdoor photography to emphasize contrast and shadows. Commonly used for landscape photography to emphasize blue skies and give clouds more visual depth. Also used for micro and infrared aerial photography applications where added contrast can be used to enhance detail. There is an approximate 4x filter factor with this filter, requiring an increase of 2 stops for normal exposure. NOTE: CHECK FILM MANUFACTURERS SPECIFICATIONS.