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Heliopan 35.5mm Medium Yellow Filter (8) from www.thelafirm.com

Heliopan 35.5mm Medium Yellow Filter (8)

HEL-735503
Regular price
$68.93
Sale price
$48.25

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 35.5mm Medium Yellow Filter is a basic contrast filter, primarily for use with black and white film, that slightly darkens skies, helps to cut through haze, and improves overall contrast. It is the most common contrast filter for black and white photography, producing an accurate tonal range and compensating for the blue sensitivity of panchromatic film. Increases the visible grey tones of green objects such as foliage. There is a 2.5-3x filter factor with this filter, requiring an increase of 1.3 to 1.5 stops for normal exposure.