Al Hauff flew air shows in his homebuilt Pitts Special from 1976 to 1985. He held the Canadian Unlmited Aerobatic title in 76-77. The photography in this video was shot from a hot air balloon in 1981 near Guelph, Ontario. The video was compiled on 1 inch tape at the University of Guelph.
https://www.youtube.com/watch?v=AMJtSvvdQA4&feature=related
https://www.youtube.com/watch?v=AMJtSvvdQA4&feature=related