Canon EOS 250D Advanced User's Manual page 139

When [Multi Shot Noise Reduction] is Set
If there is significant misalignment in the image due to camera shake, the
z
noise reduction effect may become smaller.
If you are handholding the camera, keep it steady to prevent camera shake.
z
Using a tripod is recommended.
If you shoot a moving subject, the moving subject may leave afterimages.
z
The image alignment may not function properly with repetitive patterns
z
(lattice, stripes, etc.) or flat, single-tone images.
If the subject's brightness changes as the four consecutive shots are taken,
z
irregular exposure in the image may result.
After shooting, it may take some time to record an image to the card after
z
performing noise reduction and merging the images. During the image
processing, "buSy" will be displayed in the viewfinder, and you cannot take
another picture until the processing is complete.
You cannot use AEB and white balance bracketing.
z
If [z: Long exp. noise reduction], AEB, or white balance bracketing is set,
z
[Multi Shot Noise Reduction] cannot be set.
Although flash photography is not possible, in low light, raising the flash
z
beforehand is recommended, to enable firing of the AF-assist beam.
However, the AF-assist beam will be emitted according to the setting of [z:
AF-assist beam firing].
You cannot set [Multi Shot Noise Reduction] for bulb exposures.
z
If you turn off the power, change the shooting mode to a Basic Zone mode,
z
shoot a bulb exposure, or shoot a movie, the setting will automatically be
changed to [Standard].
[z: Dust Delete Data] cannot be set.
z
Long Exposure Noise Reduction
Noise reduction is possible with images exposed for 1 sec. or longer.
1
Select [Long exp. noise reduction].
Under the [z] tab, select [Long exp.
z
noise reduction], then press <0>.
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