Image from Hama's website of the slave unit.

Just bought a Hama Slave unit “Synchromat” for my old flash because that flash does not work anymore with my DSLR. Even though the box says “DIGITAL” the slave unit does not really work with digital cameras. Let me explain:

Most cameras today fire of a pre-flash before the main flash to measure the scene. And typically what you do with a slave unit is that you chose to ignore the first flash and trigger on the second. Though the Hama slave unit does not do this. So the only way to get it to work is to pt your flash into manual mode(which will tell it not to measure the scene). Also noticed with the Canon flashes that they wont fire a pre-flash if the head is tilted upwards to bounce in the roof.