This work is part of the calibration setup.
I used the push button on the camera 10 times as quickly as
possible---about one shot every 4 seconds. I usually use the self timer however
after seeing this I decided to use the push button as it is just as good and
much faster.
The rim of the spot was marked by the 4 peripheral points.
One chart is the full CCD representation and the other
is a close up of the shots
The second chart is way below the
first one - do not overlook it--