Rev. Dr E.F.N. (Frank) Cash was the rector of Christ Church Lavender Bay and a keen amateur photographer. He was the only amateur photographer to be permitted onto the construction site of the Sydney Harbour Bridge, and took photographs throughout the building process. His photographs also include images of his family: his wife Elizabeth, son John who joined the RAAF and was killed in action in 1941, and three daughters Mary, Miriam and Elizabeth. He also took many pictures of trees, native animals and rock formations, particularly around the Glen Innes area and inside Jenolan Caves. There are also a small number of photos of the Fairbridge Farm School for child migrants in Molong, NSW.
A large number of the slides are copies of paintings and illustrations from books, as well as hymn lyrics.