Sony Cyber-shot DSC-RX100 IV - Manual (Page 62)

Hint
By assigning [AEL hold] or [AEL toggle] to a desired button and turning the control ring or
the control wheel while pressing that button, you can change the shutter speed and
aperture (F-value) combination without changing the set exposure value. (Manual shift)
[36] How to Use Shooting Selecting a shooting mode
BULB
You can shoot a trailing image of the movement of a subject with long exposure.
BULB is suitable for shooting trails of light, such as fireworks.
1. Set the mode dial to M (Manual Exposure).
2. Press the bottom side of the control wheel to select the shutter speed, then turn the
control wheel counterclockwise until [BULB] is indicated.
3. Press the bottom side of the control wheel to select the aperture value (F value), and
turn the control wheel to set the value.
4. Press the shutter button halfway down to adjust the focus.
5. Press and hold the shutter button for the duration of the shooting.
As long as the shutter button is pressed, the shutter remains open.
Note
Since the shutter speed becomes slow and the camera-shake tends to occur more easily,
it is recommended that you use a tripod.
The longer the exposure time, the more noise will be visible on the image.
After shooting, noise reduction will be done for the same amount of time that the shutter
was open. However, you cannot shoot any more while noise reduction is in progress.
You cannot set the shutter speed to [BULB] in the following situations:
When the [Smile Shutter] function is activated.
When the [Auto HDR] function is activated.
When [Picture Effect] is set to [HDR Painting] or [Rich-tone Mono.].
When the [Multi Frame NR] function is activated.
When the [Drive Mode] function is set to the following modes:
[Cont. Shooting]
[Cont. Bracket]
[Spd Priority Cont.]
[Self-timer(Cont)]
When [ Shutter Type] is set to [Electronic Shut.].