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Message: <blockquote data-quote="Malcolm Stewart" data-source="post: 1284175" data-attributes="member: 6851">I think these aspects of Canon flash were discussed extensively a few years ago on the dpreview Canon forums, but following a server crash, I fear the search function is now unlikely to return the threads. (Hope I'm wrong.)I normally use M mode when using flash; 1/125s, f5.6 and +1/3stop Flash compensation works well much of the time, whatever lens or subject matter.  A few weeks ago I tried P mode* as I wanted some fill flash when shooting indoors with my 5D.  I have a nasty feeling that in this mode the camera took complete control and with some subjects and my EF 35 f2 on the camera, the flash wasn't fired, but was fired with the EF 85 f1.8 fitted. With other subjects where the camera saw a back-lighting situation, the flash was fired with the EF 35 fitted.  Very annoying as the subjects were family and the expressions I was trying to capture weren't repeated!  Flash On/Off set by perceived subject matter is a feature of some Olympus film compacts, but I hadn't realised that it's implemented on my 5D.  Must do some more careful checks to establish the parameters.*And it was "P" mode, and not the green rectangle mode.</blockquote>