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Canon appears to be developing a new type of brighter focusing screen according to a recent patent.
Keith over at Northlight appears to have done the legwork in breaking down the patent.
A Canon patent looks at making less regularly spaced micro lenses for, amongst other things, a brighter view
Improved brightness in a viewfinder will always be a welcomed feature.
If you’re so inclined, you can read the full patent text at the USPTO.