Join Date: Apr 2000
Location: Ottawa, Ontario, Canada
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There's no real difference between the two, except that a gray screen will also reduce the effects of ambient light. That is preferable in a room where you don't have total light control or you have light coloured walls, otherwise a ND filter is probably cheaper and easier to install.
Let me empasize that if you can afford it, the GrayHawk will provide you with benefits that regular gray screens will not. Chiefly, a higher *real* contrast ratio in addition to the better black level. A regular gray screen will give you better blacks but similarly dimmer whites a GrayHawk screen will not dim the whites as much, if you have a really bright image that's not as much of a problem.