I think that Olympus needs to really sort out the current flash system as it needs serious attention. The FL600 is a bit of a toy and I'm forced to use older four thirds FL50's which are no longer being made. The current flash system is not a patch on the old OM TTL flash system that was a joy to use. Olympus, the system will never be taken seriously by professionals without more powerful flash with external battery packs. These don't need to cost a fortune as loading one with 12 AA's would work.... and yes! .... I know there are other flashes that will work but I'm referring to Olympus building their own professional system.