I'm a photographer, and have bought an ND filter for my camera.
When i put the fader filter on my camera, i have the ability to turn on of the rings, which makes it a certain amount darker for each step - usually nothing happens, if you just spin the whole thing around. But today i noticed this strange thing. When i move the entire fade round in front of my laptop screen, it gets darker.
Can you guys give me an explanation? Here is a video i recorded of the penomenohm: ND fader filter - LCD screen behaviour - YouTube