So I want to goo out and get a fllash for my camera. I haven't ever used one, only the onboard pop up. I currently am using a Canon S5 IS, but also have a Canon Rebel (Non digital) that I was hoping it would work with as well. Any suggestions out there? What kind of brands are best for what I'm working with, and are there specific features that I should be looking for? Thanks for any insights everybody. Have a great rest of your day!