The DMD Glare Eliminator does not come with any instructions, so I'll give full install details near the end of the review.
WHAT DOES IT DO EXACTLY?
The DMDGE allows light to only travel in a single direction. It does not allow it to leave at an angle and reflect off the playfield.
DOES IT DIM THE DISPLAY?
As you can see in the picture, it dims the display very slightly. But if you did not know it was there, you would never notice.
A bonus is that it makes the display have more contrast. The background becomes darker, so the overall contrast increases.
HOW MUCH GLARE DOES IT ELIMINATE?
Literally 100%.
There is not even the slightest glare from the display on the playfield glass, no matter what angle you play at.
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I mounted a camera with a wide aperture lens to a tripod at exactly my eye height and angle. This way I could make exact "before and after" pictures of what you would actually see playing the game.
Here in this picture I taped the DMDGE onto the front of a rather dark game The Shadow.
I only covered the right half of the display.
As you can see, there is no reflection on the glass at all !
On a game like The Shadow, this makes a big difference.
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