Looking for a good quality external flash unit for use with my EOS 7d.
Main lens I use is the EFS 10-22 but may also use it with the kit lens 18-135.
A friend and fellow photog uses the NIssen one (Speedlite?) and seems to get some great shots with it, and has told me not to spend the extra coin on original Canon as the aftermarket flashes will work just as well.
Any advice would be great, as would good sites where to purchase.