When using single or multiple flashes, it would be very helpful to have a real-time display of the flash level for each one in use. It can be frustrating to have to physically approach each device to check its power level.
Picture this, On camera flash has a an attached small light that clicks to the top of the flash so when pulled off it ls an extra fill flash you can raise over your head. I know you need an extra battery but why not have it tethered via a thin wire that recoils inside the main on camera flash?
