As with the built-in flash, red-eye reduction is available with an external flash.
INFORMATION
The red-eye reduction feature works even when only an external flash is used. (p.52)
If red-eye reduction is used when the SEF-36PZF is set as the slave unit or with the wireless function, the preflash for red-eye reduction will trigger the external flash. Do not use red-eye reduction when using a slave unit.