Sony DSC-RX100M4 Instruction Manual page 152

(The maximum shutter speed is limited to the flash-synching speed of 1/100 seconds.)
When using the flash to shoot dark scenes with the [Flash Mode] set to [Fill-flash]. (The minimum
shutter speed is limited to the speed automatically determined by the camera.)
[95] How to Use
Multi Frame NR
The product automatically shoots multiple images continuously, combines them, reduces the
noise, and records them as one image. With multi frame noise reduction, you can select
larger ISO numbers than the maximum ISO sensitivity. The image recorded is one combined
image.
1. MENU →
2. Press the right side of the control wheel to display the setting screen, then select a
desired value using the top/bottom side of the control wheel.
Note
When [ Quality] is set to [RAW] or [RAW & JPEG], this function cannot be used.
The flash, [D-Range Opt.], and [Auto HDR] cannot be used.
When [Picture Profile] is set to something other than [Off], you cannot set [Multi Frame
NR].
When [Picture Effect] is set to something other than [Off], you cannot set [Multi Frame
NR].
Hint
You can change the automatically set range of ISO sensitivity in the [ISO AUTO] mode
under [Multi Frame NR]. Select [ISO AUTO] under [ISO] and press the right side of the
control wheel, and set the desired values for [ISO AUTO Maximum] and [ISO AUTO
Minimum]. The values for [ISO AUTO Maximum] and [ISO AUTO Minimum] are also
applied when shooting in [ISO AUTO] mode under [Multi Frame NR].
[96] How to Use
D-Range Opt. (DRO)
By dividing the image into small areas, the product analyzes the contrast of light and shadow
Using shooting functions
(Camera Settings) → [ISO] → [Multi Frame NR].
Using shooting functions
Selecting the ISO sensitivity
Correcting the brightness or contrast