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i: Setting the ISO SpeedN
As H1 (equivalent to ISO 25600) and H2 (equivalent to ISO 51200) are
expanded ISO speed settings, noise (dots of light, banding, etc.) and
irregular colors will be more noticeable, and the resolution lower than
usual.
If [z3: Highlight tone priority] is set to [Enable] (p.180), ISO 100/125/
160, H1 (equivalent to ISO 25600), and H2 (equivalent to ISO 51200)
cannot be selected.
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.
If you set H2 (equivalent to ISO 51200) and shoot a movie, it will switch
to H1 (equivalent to ISO 25600) with manual-exposure movie shooting.
Even if you switch back to still photo shooting, the ISO speed will not
revert to H2.
Under [z2: ISO speed settings], you can use [ISO speed range] to
expand the settable ISO speed range up to H2 (equivalent to ISO 51200)
(p.157).
Even if [81: ISO speed setting increments] is set to [1-stop], you can
still select ISO 16000.