UNIBRAIN drivers are stable and good drivers, but lack the ability to provide persistent camera settings
when they are specified in the camera dialog.  We expect this issue to be resolved in the near future, but in the meantime we will have to resort to a hack, or workaround, in order to set the shutter with the value we want - and ensuring that the value will not be lost between Scorpion sessions.

The workaround is to load the shutter value straight into the camera flash memory using camera register access over the 1394 bus.

The driver never knows what is going on when we apply this hack, so camera dialog settings will not reflect the actual shutter value
as found in the camera after the operation has completed.

In the previous chapter we learned how to add a command sequence for the BeforeStart Event.

We will now expand the command sequence with:

A lookup table is presented below with relevant register values and corresponding shutter values.

The table is generated using a python module, sonyutils.py, found on the CD.  You can generate your own table.  The example below gives you a hint.

As can be seen from highlighted row in the table below, a shutter register value of 63 equals a shutter value of 4ms.