The Formatt 138mm HD Full Frame Contrast 3 Filter is a valuable tool to have when you are shooting under very bright light i.e. mid-day, beach, etc. With the explosion of HD technology, using this filter will help when shooting on location (or studio) when a more balanced tone to the image is desired.
This filter distributes the ambient light all over the image area yielding a more even appearance. Shadows will be opened revealing more detail. However, the real benefit is that the highlights will not display any flare or halation.
Reduces contrast by evening out the ambient light in the frame
Excellent when shooting under very bright light
Using this filter will allow more detail to be revealed - opens shadows