Tiffen 77mm aXent Long Exposure Filter Used to lower shutter speeds to produce a smooth softening effect to objects and matter in motion, such as water, tall grass, cars, clouds, etc. Reduces the amount of light passing through camera lens in the visual spectrum. Allows IR light waves to pass through onto the cameras sensor Especially useful in bright light conditions to help prevent overexposure; balances exposure Eliminates overly bright, washed out images