In general, If the camera is used for medium format
cameras with digital interface this setting is can be set
to either "Short latency" or "Long latency" whichever
is preferred.
Short latency has a shorter response time, but is
power consuming, so when battery time is an issue
you should select "Long latency" on the cost of re-
sponse time from the camera.
If the P back is used in "two shoot mode" on a large
format camera with i.e. a copal shutter or another
mechanical shutter where the shutter is released one
time for waking up the back, and another time for
shooting the image, then the shutter setting in the P
back should be set to "long latency".
While short latency will respond immediately to trig-
gering the camera, Long latency will not be that fast,
but in return you gain much longer battery power.
Please consult the camera specific sections in this
manual to learn more about how to use shutter la-
tency with your particular P back setup.