ND grad filters
As brilliant as current cameras are, point even the best pro DSLR at a high-contrast landscape scene and you’ll often have to choose between a burnt-out sky or an underexposed foreground.
A graduated neutral density filter (ND grad) is an effective solution. Clear at one end and grey at the other, the darker section can be positioned to cover a bright sky, restricting light transfer by several stops, so the foreground has time to expose correctly without the sky becoming a burnt-out whitewash.
Most filter manufacturers offer ND grads with hard or soft transitions between the clear and tinted sections. Hard grads are great if your scene has a straight, defined horizon. But when the landscape is less uniform, with objects like buildings or trees
