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Old October 1st, 2008, 04:37 AM
brucekeefe brucekeefe is offline
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Could a graduated ND filter be used as an aperture in a vision science experimet?

Hi all,

I'm interested in creating an aperture though which a person would view a TFT monitor. The aim here would be to have the center of the monitor visible with its edges occluded. Importantly I'd like to avoid any sharp edges that would be produced using a normal aperture (i.e. cut from card).

The idea is to have the aperture completely transparent in the center for a set viewing angle. Outside this area the amount of light would gradually decrease until the point where the aperture was completely opaque.

Does anybody know of a graduated natural density filter or similar that has these properties? I'd greatly appreciate any suggestions
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Old October 1st, 2008, 09:15 AM
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ohenry ohenry is offline
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