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To investigate the pattern of intensity levels in images generated by the two most commonly used rigid endoscopes angulations in sinus surgery 0° and 30°. An enclosed light box containing an optical square grid, under endoscope illumination set just below saturation level, was used for measuring light distribution levels across test images. Endoscopes with 0° and 30° angulations were tested at 10 mm from the grid, typical for sinus surgery. The grid was set perpendicular to the axis of the shaft of the endoscope. The grayscale light in
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