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I have an old 430 EZ(not EX) flash that has been a great flash and always provided good service on film... I tried to use it for the first time today on a 400D and it registered the focal length (on the flash) but would not fire,

Is this flash compatible with the newer digital technology??

I at least expected it to fire and at worst metering be out. Are digital cameras diff to film in that any flash will fire on a film camera, they just need to be used in manual mode if not a dedicated flash,

Thanks
Robert

check this site out it will answer most of your questions
http://photonotes.org/articles/eos-flash/
zsolt

It resulted me in a negative feedback on ebay because of that.