Prevent Burning Out Your Camera | Flashpoint - Official Website

If the issue of camera sync voltage is not taken into consideration, the sync voltage of some old flash units could potentially damage the camera. However, this problem does not exist when using wireless devices or PocketWizards. By reviewing relevant information, you can find out whether the combination of the flash and camera you are using is safe. The article also states that several older flash models previously recommended are all within the range of safe use.