Sony ILCE-1 Help Manual page 252

In slow-motion recording, the shutter speed becomes faster and you may not be able to obtain the proper exposure. If this
happens, decrease the aperture value or set the ISO sensitivity to a higher value.
During slow-motion/quick-motion recording, the following functions are not available.
[Time Code Run]
[Time Code Output]
Related Topic
S&Q Motion: Exposure Mode
Recordable movie times
Memory cards that can be used
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