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Hi Bryan,
If it shows f2.0 then that means it is working the way it is supposed to (communicating with camera). (unless there is some issue associated with 40D, but I am not aware of that.. I have 400D and my adapter works OK - when it works, that is.. it is a bit intermittent, loosing that f2.0 from time to time).
The rest is up to your camera... because the actual focussing circuit (the array of small CCD or CMOS sensors) is in your camera, at the bottom of the mirror box (opposite to the focussing screen).
Most likely your lens does not produce enough contrasty image for circuit to decide you are at focus..
Try with the lens which has shorter focal length.. or use bigger f number, a great number of lenses do not perform well while wide open. Or try on bright star...
Last edited by bojan; 11-02-2008 at 07:15 PM.
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