Do not buy these things so to trigger modern Canon flashes. Funtioniert once and then you have the flash Unignore that the internal thyristor can discharge, very old style of Hama and a joke to sell something today. Now have 2 dice which I "throw" can. Problem is a thyristor in Hama, where modern 'digital' lightning should be a transistor. Googling times previously, have unfortunately noticed that the problem is known.