Nikon EN-EL9 D5000 User's Guide (English) - Page 169

Long Exp. NR G button ➜ C shooting menu If On is selected, photographs taken at shutter speeds slower than 8 s will be processed to reduce noise. The time required for processing is roughly equal to the current shutter speed; during processing, "l m" will blink in the viewfinder and photographs can not be taken. In continuous release mode, frame rates will slow and the capacity of the memory buffer will drop. Noise reduction will not be performed if the camera is turned off before processing is complete. High ISO NR G button ➜ C shooting menu Photographs taken at high ISO sensitivities can be processed to reduce "noise." Option Description S High Noise reduction is performed at ISO sensitivities of ISO 800 and higher. While T Normal photographs are being processed, the capacity of the memory buffer will U Low drop. Choose the amount of noise reduction performed from High, Normal, and Low. Noise reduction is only performed at sensitivities of Hi 0.3 and higher. The Off amount of noise reduction is less than the amount performed when Low is selected for High ISO NR. i 151