Here’s an interesting little setup which Many people haven’t considered. I’ve been shooting a lot with the little EOS-M , Canon’s mirrorless camera and it came packaged with the little Canon 90EX flash. It’s powered by just two AAA batteries and that means that it is decidedly pocket sized ! Whilst it’s marketed as a flash for the EOS-M , it works just fine with any Canon camera that has a hot shoe. If you use a 5D , a camera with no built-in flash, then it can also be a handy accessory for general shooting and at $150 it