It'll work with your 300D, but you won't be able to take advantage of ETTL II, since the body doesn't support it.
"Consulting the rules of composition before taking a photograph, is like consulting the laws of gravity before going for a walk." - Edward Weston "The Edge... there is no honest way to explain it because the only people who really know where it is are the ones who have gone over."-Hunter S.Thompson
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"The Edge... there is no honest way to explain it because the only people who really know where it is are the ones who have gone over."-Hunter S.Thompson