The Formatt 6 x 4" Yellow 3 Filter is commonly used for a slight increase in contrast with black and white films.
There are occasions when your image needs a nudge - something to bring the contrast up enough to make it noticeable and produce a "snap". A basic Skylight filter will add a touch of warmth to the shot but a Yellow 3 is the next step up the contrast ladder and should be considered a valuable asset to any gear bag.
Enhances landscapes, marine scenes and aerial photography with more effect than a skylight filter
Especially useful for increased contrast between blue sky with clouds and foreground
Formatt Hitech BF 6X4BW3YEL4 Specs
6 x 4" (150 x 100mm, 4mm thick)
Not Specified by Manufacturer
Renders sky a touch darker
Contrast control Enhanced skin tones Tonal corrections Slightly darker landscapes