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Recently, I had a chance to travel in a 787 Dreamliner airplane. This plane has much wider windows as compared to other planes, but does not have physical window shades. Instead, to control the amount of light coming from the outside, the darkness or lightness of the window pane is controlled electrically. We need to press a button to increase the darkness of the pane and press another button to make the shade of the window pane lighter.

Can this technology not be used in a DSLR camera instead of a mirror? Will it be possible to keep a dark mirror / glass plane such that it reflects light into the viewfinder and when the shutter is pressed, remove the tint from the glass pane so that light can pass straight to the sensor?

Interesting thought. Now. Where did I keep my battery and test kit?