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2. Using Other Flash Units
Other universal-type auxiliary flash units may be used, but they
should be used only at camera-to-subject distances exceeding the
range of the camera's built-in flash (overexposure will result if such
external flash units are used at closer distances). Consult the
operating instructions for the auxiliary flash unit involved regarding
usable operating ranges.
© Set the camera's flash mode to " ^
Both the camera's
internal flash, and the attached external flash will be fired.
®
Set the camera's exposure mode to aperture-priority.
if the external flash unit is designed for external automatic
exposure, set the camera's aperture to the flash-synchro value
indicated by the flash. If the external flash unit is designed for
manual flash exposure, use the following formula to calculate
the aperture required for optimum exposure at the camera-to-
subject distance used, and set the aperture accordingly.
Subject distance (m) = Flash Guide Number (at ISO 100) /
Aperture value
@ Press the shutter release only after confirming that both
internal and external flash units are fully charged.
• If the camera's flash mode is set to "
only the external flash will be
fired, and the camera will operate in slow-shutter synchronization mode,
producing exposures of up to 16 seconds depending on subject lighting
conditions.
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