In article , etclau@hkusua.hku.hk says...
>The TTL function is still working ? (with one of the pin covered)

Yes. With the middle pin covered on the F3 TTL shoe, all works
as before, but the ambient light TTL meter stays on when the
flash is turned on, the ready light is gone, and shutter speeds
above the synch speeds are not locked out (Watch the shutter
speed selected when flash is on!).
Hope this helps.