"When he threw the ball on, he put his hand in his pocket. The cameraman - and these are big, big lens cameras - he zoomed into his pocket. The slow-mo operator looked at it, spooled it back and forth, then zoomed in and could see the yellow spot."source https://timesofindia.indiatimes.com/sports/cricket/news/an-absolute-fluke-how-a-cameramans-chance-zoom-exposed-australias-2018-sandpapergate-scandal/articleshow/134830863.cms