> It is likely that this is because the extension tubes don't "tell"
the body
> about their presence the way the extenders do, so the AF system
doesn't "know"
> that it's working at f/8 (at the long end).
Arrghhhhhhhhhhhh
Not again!!!!!
<RANT>
An extension tube DOES NOT change the aperture.
If it really was f4 before; it remains f4.
</RANT>
> One question might be, how well does
> the AF work in this situation?
It does not work as well for sure.
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