Hello,
My wife and I do most of our photography outdoors (landscape/wildlife) as such the flash that is built into my Canon Rebel XT has been sufficient for family 'snapshots'. However, more and more we've been asked to take pictures at professional conferences, seminars and other mid sized gatherings. Since most of these occur indoors (classrooms, conference rooms, lobbies, etc.) the flash is not strong enough nor adjustable enough to create good looking images. What should I look for in getting a hot-shoe flash and are there any decent ones out there that won't break the bank (<100 dollars). Also what should I look for when purchasing a used unit. Any help would be great. Thank you.