What was the purpose?
I suspect (having seen them attempt it with flip HD camcorders with a similar rig on tv) they were trying to recreate the bullet time special effect from The Matrix.
It's a film effect where the action stops and then the camera angle pans a ful 180 degrees round the subject.
bullet time special effect from The Matrix.
if my memory serves me correctly, they were all canons...?
I think the best time it's been used is the first scene of swordfish