CFn II Long exposure noise reduction
If you like to shoot long exposures of star trails, urban cityscapes, or f/32 interiors, this is the setting for you. You can use various noise reduction programs after the fact, but they probably won't do as good a job subtracting the specific noise signature of your 5D Mark II as the built-in correction.
► 0. Off. This means no noise reduction is applied.
► 1. Auto. Noise reduction is performed automatically for long exposures over 1 second if noise is detected. This setting is effective in most situations.
► 2. On. Noise reduction is performed for all exposures over 1 second. This may be a good option if you're still noticing noise in images shot in the Auto mode. Noise reduction is applied after the image has been taken and may delay the time it takes the camera to return to a ready state, possibly equaling the duration of the time exposure. This also happens in the Auto mode. During Live View shooting, Live View is interrupted, a busy message appears in the LCD panel, and you can't shoot again until noise reduction is completed.
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