... 1. Both have Flash& Video function. 2. Guide number is 50GN 3. Have four flash method ... OFF:Close buzzer.4.Prevent IR Choice : M:Camera Hotshoe Flash,X line Flash, Hand Flash,Wireless ... the second time Flash. S3:Continous-flash function,Camera Hotshoe Flash,IR Flash,X line Flash, Hand Flash ... Flash.Everytime can flash 5 times. S4:Continous-flashfunction,Camera Hotshoe Flash,IR Flash, X line Fash, Hand ...