Kodak 4 x 12" #9 Deep Yellow/Green Wratten Gel Filter for Black & White Film

The Kodak 4 x 12" #9 Deep Yellow/Green Wratten Gel Filter for Black & White Film is commonly used for a noticeable increase in contrast with black and white films.

Note:

Most Kodak gelatin filters are available in 3 x 3" (75 x 75mm), 4 x 4" (100 x 100mm), 6 x 6" (150 x 150mm), 14 x 18" (350 x 450mm) and 4 x 12" (10.2 x 30.5cm)

Especially useful for clear contrast between blue sky with clouds and foreground