Formatt 6.6x6.6" Color Graduated Cool Blue 2 Schott-Desag B270 Crown Optical Glass filters (Soft Edge) are one of the most widely used categories of filter. They enhance reality, adding a touch of subtlety or drama to the image.
Often it is necessary or desirable to balance the light intensity in one part of a scene with another. This is especially true in situations where you don't have total light control, as in bright contrasty landscapes.
Sometimes it is also desirable to add color to part of the photograph. For example, to add blue to only the sky. Formatt Color Graduated filters are half-color, half-clear, with a graduated transition for blending into the scene. They are available in an array of colors. Soft/hard indicates the degree of transition
Formatt Color Graduated Cool Blue filters comes in strengths from 1-3 with 3 having the greatest effect
Some of the most popular applications include
Adding color excitement to a drab sky
Changing the specific color in a scene to create a desired special effect
Enhancing the existing color or creating subtle color drama
Creating more balanced exposure in uneven lighting conditions
Formatt Grads are available in four types
Soft Edge - Half clear, half colored with a smooth transition to full density. Generally used with medium to wide angle lenses
Hard Edge - Half clear, half colored with a definite less subtle transition. For use with long focal length lenses
Razor Edge - As hard edge but with a solid transition line for shooting corners of buildings, knife-edge horizons or when a very bold transition is required.
Attenuator / Blender - The grad line is right at one edge of the filter so the color change runs from top to bottom. Perfect for irregular objects and skylines