EOS 5D Mark IV: Bulb and touch shutter

When shooting a Bulb exposure, it is advisable to use a remote release where possible. However, the touch shutter feature of the EOS 5D Mark IV makes an alternative option that is not as likely to introduce vibrations because it only requires a touch, rather than a press. To use this with Bulb mode, simply enable touch shutter, then touch the screen to begin the exposure. Touching the screen a second time will end the exposure.
Camera settings
EOS 5D Mark IV