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to the TTL socket. It indicates three separate states as described below.
Ready signal
A steady red light indicates that the flash unit is charged and ready to be fired. Absence
of any signal indicates the need for fresh batteries.
Confirmation signal
A flashing red light occurring for just over a second immediately after exposure confirms
that the light output was sufficient for a proper exposure. It then remains dark until the
flash unit has recharged. The steady red light will then reappear indicating operative
status again. The time of reappearance however may vary according to the condition of
the batteries.
No result signal
Absence of the flashing confirmation signal after exposure indicates that the flash emit-
ted was not sufficient for correct exposure. The aperture must then be opened more or
the flash distance to the subject reduced. Changing to a faster ISO setting on the digital
back is also a possibility.
See appropriate manuals for connection details regarding the various units and
adapters.
