Digital Concepts DC-GR3-PH3 Gradual Grey, Orange, Blue Filter for Phantom 3 (Black) Graduated Grey Filter reduces light on the top and has a soft transition to a clear on the bottom Graduated Orange Filter provides color correction to the sky while keeping the ground the same color Graduated Blue Filter intensifies the blue in the top of the frame while also reducing the shutter speed on the top by around 1.3 stops