The 114° Threshold: Not a choice, but a physical “ceasefire” where optical ambition meets manufacturing reality.
Physics of cos4 θ: Peripheral light loss and chromatic aberration form the primary “wall” for ultra-wide FOV.
Manufacturing Limits: Steep “Sag Values” in aspherical molding dictate production yields; 1% more FOV can drop yield to zero.
Engineering Legacy: True completion involves documenting these boundaries as organizational assets to empower the next generation of innovators.