Hasselblad 503CW Instruction Manual page 29

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Automatic flash control is provided by the camera's
built-in flash sensor and electronics
that measure the
light reflected from the central portion of the film sur-
face; a circle with a diameter of 40 mm. The metering
system is connected to a selector for setting film speed.
When a Hasselblad D-Flash 40 is attached - or a
System SCA 300 or 500 dedicated flash unit is con-
nected through the SCA390 or 590 flash adaptors - the
FIash
system controls the flash unit and cuts off the flash
when the exposure is correct, Under the left hand edge
of the focusing screen an indicator light shows when
the flash is ready to be operated and also confirms if
the flash output was sufficient to give a correct expo-
sure. The flash unit powers the camera's electronics
and also the flash adaptor, when that is used,
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