Maximum seat distance

A floor plan with distances marked. The last row of a drama theater should not be more than twenty meters from the proscenium opening, beyond which facial expressions become unclear. For opera and concerts, this can extend to over thirty meters. The horizontal viewing angle should be controlled within thirty degrees on each side of the central axis. Positions beyond this range should preferably not have seats. Avoid: extending the back rows beyond the limit to increase seating capacity, placing regular seats at extreme side angles, making the auditorium a wide and shallow fan shape, ignoring stage distortion caused by viewing angles.

Translated from Chinese by AI.

一張標出距離的平面。話劇廳的最後一排距離台口不超過二十公尺,超過就看不清表情;歌劇與音樂會可以拉到三十公尺以上;水平的視角範圍控制在中軸兩側各三十度內。超出的位置寧可不要設座。避免:為了增加座位數把後排拉到極限之外、在極端側角設置正規座位、把觀眾席做成又寬又淺的扇形、忽略視角造成的舞台變形。