|
|
|||||||
|
Having bought my 550EX flash guns some years ago, I was a bit surprised to see (somewhere in Canon literature, but obscure?) that they're not fully compatible with the latest bodies, and that the 580EXII, 220EX and ST-E2 fare better, with the latest bodies, where AF illumination is concerned. I don't know how the 40D sits in this but perhaps worth checking out, and the warnings aren't included in the "Specifications" pages of the manual. |