A hard edge graduated filter is characterized by a very sharp transition between the clear and neutral density sections of the filter. A hard edge grad allows the photographer to control with great precision the desired effect of the image – especially when the transition between two areas in the frame is particularly abrupt, such as a flat horizon line over the ocean. The effect of the filter ‘carrying over’ from one part of the frame to another would be undesirable.
The 0.6 and 0.9 grad filters are two of the most commonly used grad filters in landscape photography, and are great for shooting on bright sunny days as it will even out exposure and bring out the rich blue color of the sky! The 0.6 Graduated ND Filter will reduce the exposure in the top part of the frame by 2 f-stops, and the 0.9 Graduated ND Filter will reduce the exposure in the top part of the frame by 3 f-stops.
Graduated filters are rectangular in shape so that you have the ability to manipulate where the grad line falls within the frame. If you wish to have more skyline than foreground simply move the filter down within the holder. Moving the filter up within the holder will allow for more foreground than skyline, you have ultimate creative control!