Every time he dived, he recorded distance, exposure, f-stop, water temperature, visibility, and any other factors affecting photography. By 1976, he was getting consistent results, and he published a book of undersea photos.
他每按一下快門，就記下拍攝的距離、光圈、速度，和當時海水的溫度、能見度……，再對照所拍照片的效果，理出一些海底攝影的原則，曾發表在戶外雜誌上。