u dont have a D200 by any chance? (edit- just read the 400d sig) as u can set it up to AF and interval shooting. i tried that once, shot every 5 seconds, and it focuses before it shoots, awesome feature.


otherwise, the other way to do it is to focus on something that is the same distance as ur eyes - ie line up an object... and then once it's in focus place it in manual focus mode so it doesnt change. and shoot from there using a timer or remote.


third way.. trial and error with plenty of shots using a centred average focus metering.