Canon EOS RP Mirrorless Camera - Manual (Page 132)

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Setting the ISO Speed for Still Photos
ISO Speed Guide
z Low ISO speeds reduce image noise but may increase the risk of
camera/subject shake or reduce the area in focus (shallower depth of
field), in some shooting conditions.
z High ISO speeds enable low-light shooting, a larger area in focus (deeper
depth of field), and longer flash range but may increase image noise.
o As H1 (equivalent to ISO 51200) and H2 (equivalent to ISO 102400) are
expanded ISO speed settings, noise (dots of light, banding, etc.) and irregular
colors will be more noticeable, and the resolution lower compared with the
standard setting.
o As L (equivalent to ISO 50) is an expanded ISO speed setting, the dynamic
range will be somewhat narrower compared with the standard setting.
o If [
z
: Highlight tone priority] is set to [Enable] or [Enhanced] ( = 137), L
(equivalent to ISO 50), ISO 100/125/160, H1 (equivalent to ISO 51200), and
H2 (equivalent to ISO 102400) cannot be selected.
o When shooting with a high ISO speed, high temperature, long exposure, or
multiple exposure, image noise (rough grain, dots of light, banding, etc.),
irregular colors, or color shift may become noticeable.
o 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.
o If you use a high ISO speed and flash to shoot a close subject, overexposure
may result.