Sony MVS-8000 User Manual page 169

Note
It is not possible to cancel recalling a master snapshot.
Creating and saving a master snapshot with the numeric keypad
control block
To create and save a master snapshot with the numeric keypad control block,
refer to the operations in "Creating and Saving a Master Timeline Using the
Buttons in the Numeric Keypad Control Block" (page 151). Note, however,
that in place of the [EFF] button in the numeric keypad control block, the
[SNAPSHOT] button is used.
Snapshot Operations From the Numeric Keypad Control Block
169