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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--