The Cokin Color Back Filter - Yellow will help correct the strong dominant yellow seen in some sunlit exteriors. It is great for naturally reinforcing a clear contrast between blue sky with clouds and foreground. Made for photo and video cameras, once this filer is place on the lens it will modulate the quantity of light that reach the sensor in order to modify colors, contrast, saturation, shutter-speed, depth-of-field and other such parameters. *Note: included is a plastic piece for protecting the filter, a filter for aiding in flash and a small case.