I use gigapan to take panorama photos. I prefer using autofocus even for panoramas. Sometimes (sky or other homogenous area) the camera fails to find the focus and does not take the photo. Gigapan moves on, one or more shot is missing (especially if I chat with people interested in the equipment).
Gigapan can receive the feedback of shutter operation through a dedicated socket. I use a 5DII camera. It has both a prontor contur and hotshoe that I can use for this purpose.
Which is the more reliable source of shutter feedback? I found opinions both being not reliable.