Sony Alpha 9 - Manual (Page 116)

ILCE-9
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ISO AUTO Min. SS
If you select [ISO AUTO] when the shooting mode is (Program Auto)
or
(Aperture Priority), you can set the shutter speed at which the ISO
sensitivity starts changing.
This function is effective for shooting moving subjects. You can minimize
subject blurring while also preventing camera shake.
MENU  (Camera Settings 1)  [ISO AUTO Min. SS] 
desired setting.
FASTER (Faster)/FAST (Fast): The ISO sensitivity will start to change at
shutter speeds faster than [Standard], so you can prevent camera shake
and subject blurring.
STD (Standard): The camera automatically sets the shutter speed based
on the focal length of the lens.
SLOW (Slow)/SLOWER (Slower): The ISO sensitivity will start to change at
shutter speeds slower than [Standard], so you can shoot images with
less noise.
1/16000 – 30": The ISO sensitivity starts to change at the shutter speed
you have set.
Hint
• The difference in shutter speed at which ISO sensitivity starts to change
between [Faster], [Fast], [Standard], [Slow], and [Slower] is 1 EV.
Note
• If the exposure is insufficient even when the ISO sensitivity is set to
[ISO AUTO Maximum] in [ISO AUTO], in order to shoot with an appropriate
exposure, the shutter speed will be slower than the speed set in
[ISO AUTO Min. SS].
• In the following situations, the shutter speed may not function as set:
– When the maximum shutter speed has changed based on the
[ Shutter Type] setting.
– When using the flash to shoot bright scenes. (The maximum shutter speed
is limited to the flash-syncing speed of 1/250 seconds.)
– When using the flash to shoot dark scenes with the [Flash Mode] set to
[Fill-flash] or [Wireless]. (The minimum shutter speed is limited to the speed
automatically determined by the camera.)