Ricoh Aficio G700 用户手册

You can attach an external flash and 
other accessories (available in stores) to 
the  accessory shoe.

You can only use an external flash 
equipped with both of the following functions.
•  Slave flash function (flash is triggered in response to the firing of 

another flash)

•  Pre-flash support function (flash is synchronized with the second 

flash instead of the pre-flash)

•  The accessory shoe conforms to JIS B7101.
•  You cannot use an external flash with no spring or lock mechanism.
•  You cannot use an external flash for which synchronization with the pre-flash 

cannot be cancelled.

The accessory shoe does not support a synchronizer contact.