I bought the flash on my P7700, because I wanted to use a hot shoe, on the other hand with the P7700 also unleashed flashes is possible. The flash of the P7700 can be used as a Commander merely passive - do you mean, he will flash when shooting is not, but sends only via pre-flash a signal to the 44 AF-1. Flash is efficient (with my Eneloop batteries), the recycling time is quite fast. I would buy the Metz 44 AF-1 again.