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The Formatt 4 x 4" Yellow-Green 11 Filter is commonly used for a noticeable increase in contrast with black and white films.
The #11 yellow is a bit more contrasty than the #9. Contrast in black and white is generally controlled by yellow, orange and red filters with red producing the greatest contrast. Moderate changes can be accomplished with yellow which can, generally, bump up the contrast just enough to make the difference between a "muddy" print and an acceptable image.
If used with color film, it will render everything yellow producing a more pronounced surreal effect.
Enhances landscapes, marine scenes and aerial photography with more effect than a Yellow 9 filter
Especially useful for a noticeable increase in contrast between blue sky with clouds and foreground
In the Box
Formatt Hitech 4 x 4" Yellow-Green 11 Filter
Table of Contents
4 x 4" (100 x 100mm, 4mm thick)
2 (+1 stop) (approx)
Greens are lightened to reveal more detail and red blossoms darkened