Canon EOS REBEL T2I Instruction Manual page 6

Custom Function Settings*
_L_ When i or 2 iS set high:speed Sync Cannot be uSed With art externai Speediite
C,Fn ll: Image
0: Off
1: Auto
For 1 sec. or longer exposures, noise reduction is performed
automatically if noise typical of long exposures is detected. This [Auto]
setting is effective in most cases.
2: On
Noise reduction is performed for all exposures of 1 sec. or longer. The
[On] setting may be effective for noise that cannot be detected or
reduced with the [Auto] setting.
@ W th setting i and 2, aftei the p cture iS iaken, the nO Se redUct On
propess may take the same amount of time as the exposure. You cannot
take another picture unti! the n0ise reduction process is completed.
® At ISQ 1600 and higher, noise might be more pronounced with setting 2
than with setting 0 0r 11
® With setting 2, if a Io0g exposure is shot during Live View dispiay, '!BUSY" will b#
displayed during the noise reduction process. The L!ve View display w!H not
appear until the noise reduction is completed. (You cannot take another picture.)
Reduces the noise generated in the image. Although noise reduction is
applied at all ISO speeds, it is particularly effective at high ISO speeds. At
low ISO speeds, the noise in the shadow areas is further reduce& Change
the setting to suit the noise level.
0: Standard
1: Low
2: Strong
3: Disable
With Setting 2, the maximum burst for continuous sh00iing will greatly
decrease.
193