About this radio trigger is pretty much all been said. Actually, a great product for little money. I've bought myself together with the YN-622N-TX controller to adjust the flash output without contact can. I Flash mostly manually, therefore does not interest me the TTL mode so much. For me it was primarily concerned with the opportunity to really get to adjust the power easily to the controller in manual mode. Unfortunately I can not make sense with my light meter use (Sekonic L-758D), as must be set to TTL even in manual mode, the flash. Here the flash (Nikon SB-600, SB-700) continues to pump a weak TTL pre-flash which deceives the exposure meter. The main flash he ignored. I do not know if there are flash meter that can ignore the TTL pre-flash. In my Sekonic this obviously works only in combination with the more expensive PocketWizard system.
