回复：You need to decide which route (infrared or radio) you want t

Your 7D camera already has a built-in infrared trigger. Unless you are very serious, or you shoot outdoor alot with flashes, infrared is better for you. Two 430exii is a good choice.  If you want to do studio photography, you will need 3 to 4 flashes.

Happy New Year and Happy Shooting!

Alex