fsnfs
what is that I means is that:
when mounted a OLD lens which use Manual-focus only, It can not speak a Warning sound form the 400D when on foucs.
This would be a great wee hack - I have the same problem - I have some nice old pentax screw mount lenses, and an adapter to mount them on the canon mount, but the problem is the focus sensor doesnt go at all!
It would make it soo much easier to use manual lenses if the focus indicator still worked!
Anyway, this is a fantastic hack guys -I really appreciate the time & effort you've put into keeping these older cameras "up there" capability wise. I love my spot metering, and often use the iso3200 for checking framing for night shots..