Yellow #12 is commonly used for a noticeable increase in contrast with black and white films. Especially useful for clear contrast between blue sky with clouds and foreground Recommended as a basic filter for use with Kodak Aero Ektachrome Infrared film. Contrast control, enhanced skin tones, tonal corrections and more dramatic landscapes; "Minus blue" cuts haze in aerial work. Suitable for landscapes and nature scenes; Reduces excess blue of full moon in astrophotography. Filter factor: 2 (+1 stop)