To get awesome awesome footage of blue skies and clear water, use a circular polarizer.  This works just like polarized sunglasses, reducing harsh glare and making things clearer. The when the sunlight passes through our atmosphere and reflects of buildings glass and the environment, light is scattered and the light waves become aligned in all different planes of direction.  If you filter out all but one plane of direction (such as by using a circular polarizer), you can see more clearly.  The sky appears a deeper blue, and glare on water and glass is greatly reduced. If you’re curious, we use the B+W 77mm Kaesemann Circular Polarizer with Multi­Resistant Coating