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"A 2.35:1 screen will by definition be wider, thereby increasing the angle at which the projected image strikes the screen. Screen materials have reduced gains at higher incident angles. This change in gain may reduce the apparent brightness of the projected image nearer the edges to the point of distraction.
Are guidelines available which suggest a maximum allowable change in gain to avoid distraction?"
There can be quite a bit of rolloff in gain before it is noticable, but a properly designed screen is almost not going to have this issue as a 1.0 gain screen should have a near full field of reflectivity (180 degrees).
Even dispersion of all light falling onto the screen through a near 180 degree field is going to produce more even results across all viewing areas. Keep in mind that people sitting to the left or the right of a current 4:3 or 16:9 screen have the same issue possible where they are increasing the angle to the edges to 2.35:1 or greater angles... and there aren't any complaints.