Zenith 12 Manual page 10

Set the Speed Dial [1 ]
appropriately according
to the subject. The dial
is marked in figures
that represent tractions
of a second-i.e* "60" is
Veoth second. It may be
turned in either direction
but not between "500"
and "B" and must not be
left between marked
speeds.
Initially we suggest that
outdoors the speed set
should not be less than
1/125th sec.
10