The  sync flash shoe to insert onto all direct X-contacts (except Minolta Dynax models) as well as photo and lamp tripods. It has a 1/4 inch thread. The photo cell on the front of the sync flash shoe picks up the flash and at the same time triggers the flash inserted on the direct X-contact. You can also connect another flash to the camera via the X-contact of the flash shoe and trigger it.

WARNING
The use of the Servo Trigger is restricted, because it is just operable for flashes with high-voltage condenser ignition circuit such as in older flash devices. Modern flashes with low-voltage ignition circuit, just like the Canon Speedlite 430 EX, do not have this function. By changing an electronic component, it is possible to use the Servo Trigger with modern flashes (you can find instructions in the web). For electronic hobbyists this should be no problem at all.

Please be aware that during the reconstruction of this article except the warranty expires.