Select  to reduce “noise” (bright spots or fog) in photographs taken at shutter speeds slower than 1 s.
Long-exposure noise reduction is performed after the photo is taken. During processing, the message, “” will appear in the shooting display and “Job NR” will flash in the control panel. Pictures cannot be taken until the message has cleared from the display. The time required to process photos after shooting roughly doubles.
If the camera is turned off before processing is complete, the picture will be saved but noise reduction will not be performed.