focus confirmation adapter (Nikon F mount to EF mount)

regarding the focus confirmation adapter (adapting Nikon F mount lenses to Canon EF bodies)...will the focus confirmation indicator light up for both manual focus and autofocus nikon lenses? or just for the autofocus ones? i'm a bit confused since i was under the impression that manual focus nikon lenses don't have the circuitry to communicate to the canon body that they are in focus (since they are MF). but then i realized that the circuitry that tells the camera whether a lens is in focus could be on the camera body (since the AF sensor is in the camera body)...but in that case why would one need an adapter that allows focus confirmation, if it is the body that checks if things are in focus?

i have no clue how focus confirmation works and how the adapter sends information...

The chip on the adapter "tells" the camera that there is a lens mounted (mounting a lens without a chipped adapter will make the camera think that there is no lens there and it will report an aperture value of "00", just like if you turn on the camera without a lens attached).

The camera will, when knowing there is a lens attached, light up the focus point that is in focus, at least for a Nikkor MF lens (I´ve used a number of MF Nikkor and Zeiss lenses with chipped adapters). I don't know how an AF Nikkor would behave on a Canon camera, though, but I'm sure it works as well.

To answer your question: Yes, it is the camera body that checks for focus (and sends signals to the lens' AF motor to turn in either direction to achieve focus). However, if the camera thinks that no lens is attached (such as when using a no-chip adapter) it will not check for focus (because that would be pointless without a lens attached).

The latest AF-confirm adapters actually fool the camera into thinking there is an AF lens attached (old adapters report an MF lens to the camera, which of course is the case most of the times). This means that a shot can't be made unless at least one AF point is lit up. You can thereby shoot moving targets by fully depressing the shutter, then try to focus on the subject (while still keeping the shutter release down). The shot will be taken as soon as one AF point is in focus, but not sooner.