The Marumi Magnetic Gradual Grey Filter Reverse GND8 (100x150mm) is a rectangular filter which allows you to capture a continuously changing landscape beautifully and easily. The Marumi Reverse GND8 (Graduated Neutral Density) is specially designed for use with the Marumi Magnetic Filter Holder M100, which is available separately (see optional accessories). Due to the magnetic frame you attach the filter safely and quickly to the filter holder. The darkest part is in the middle of the filter glass, with the glass being increasingly transparent towards the upper side. This makes the Marumi Reverse GND8 extremely suitable for photographing sunrises and sunsets.