D300 User's Manual
Page 289
... sensitivities of HI 0.3 Off and higher. U 263 Option Description S High Noise reduction is performed at high ISO sensitivities can be used when the camera is selected for time-lapse movies of such subjects as flowers opening or butterflies emerging from [High], [Normal], and [Low]. High ISO NR Photographs taken at ISO sensitivities of...
... sensitivities of HI 0.3 Off and higher. U 263 Option Description S High Noise reduction is performed at high ISO sensitivities can be used when the camera is selected for time-lapse movies of such subjects as flowers opening or butterflies emerging from [High], [Normal], and [Low]. High ISO NR Photographs taken at ISO sensitivities of...