Some filter effects can be replicated via Photoshop, such as a graduated neutral density filter used to darken the sky in an image. However, some physical filters cannot be replaced, including a polarizing filter and a solid neutral density filter. In the video below, David Bergman shows us the impact a neutral density filter has on your photography. With a neutral density filter, you can slow down your camera's shutter speed. This is achieved by reducing the amount of light that goes through your lens and onto your camera...
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