Canon EOS R5 C VR Creator Kit with RF 5.2mm f/2.8 Dual Fisheye Lens - Manual (Page 144)

Note
ISO speed can also be set in the ISO speed item by pressing the < > button
with an image displayed on the screen.
Can also be set on the [
ISO speed ] screen in [ : ISO speed settings ].
To expand the available ISO speed range from L (equivalent to ISO 50) to H
(equivalent to ISO 102400), adjust [
ISO speed range ] in [ : ISO speed
settings ] ( ).
Caution
Image noise (dots of light or banding) and irregular colors may increase and
apparent resolution may decrease at H (equivalent to ISO 102400), because this is
an expanded ISO speed.
Because L (equivalent to ISO 50) is an expanded ISO speed setting, the dynamic
range will be somewhat narrower compared to the standard setting.
Setting [
: Highlight tone priority ] to [ Enable ] or [ Enhanced ] ( ) will prevent
you from selecting L (equivalent to ISO 50), ISO 100/125/160, or H (equivalent to
ISO 102400).
When shooting with a high ISO speed, high temperature, long exposure, or multiple
exposure, image noise (graininess, dots of light, banding, etc.), irregular colors, or
color shift may become noticeable.
When shooting in conditions that produce an extreme amount of noise, such as a
combination of high ISO speed, high temperature, and long exposure, images may
not be recorded properly.
If you use a high ISO speed and flash to shoot a close subject, overexposure may
result.
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