The latest "ring" unit from Metz, the 15 MS-1 takes advantage of the wireless flash capabilities included in many of the current DSLRs, and as a result is compatible with most of the major camera systems available.
There are no heavy powerpacks or cords!
Mounting the unit on the front of your lens is straightforward. Three adapter rings for 52mm, 55mm and 58mm are supplied and the flash simply clicks into place on the front of it. The fitting is secure and allows the unit to be rotated freely whilst shooting.