Hi
I used mirror lockup on my 400d for the first time recently. I found that with my cable release I had to press it twice for it to take a picture. This may seem obvious to all but it confused the hell out of me. I thought I had broken the cable release.
I use Focus assist to focus, this doesnt seem to work with mirror lock so usually i turn it of, focus then turn it back on when i want to take a picture.
Paul
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