Canon EOS 80D User Manual
Page 149
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: Setting the ISO Speed for Still PhotosN
As “H” (equivalent to ISO 25600) is an expanded ISO speed setting,
noise (dots of light, banding, etc.) and irregular colors will be more
noticeable, and the resolution will be lower compared with the standard
setting.
If [z3: Highlight tone priority] is set to [Enable], ISO 100/125/160 and
“H” (equivalent to ISO 25600) cannot be selected (p.174).
Shooting in high temperatures may result in images that look grainier.
Long exposures can also cause irregular colors in the image.
When you shoot at high ISO speeds, noise (such as dots of light and
banding) 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.
You can expand the settable ISO speed range up to ISO 25600 (H)-
equivalent with [Range for stills] under [z2: ISO speed settings]
(p.151).