Collins was most notable for his photography of the native New Zealand bush. Many of these images were included "The Story of the Kauri", by A. H. Reed which was published in 1953. Furthermore, Collins work towards protecting the Kauri trees in Warkworth was instrumental for the local community and he was honored for this contribution by the Tudor Collins Drive which was established in his memory at Parry Kauri Park. However the subject of his photographs also extended beyond the New Zealand bush. "The New Zealand Herald" often recruited Collins to cover current events that were taking place around the country. For example, he was one of the first photographers in Napier after the Hawke’s Bay earthquake of 3 February 1931; he recorded the riots in Auckland’s Queen Street on 14 April 1932; and he was the only photographer to meet the passengers and crew from the mined "Niagara" on 19 June 1940. US servicemen stationed at Warkworth were also photographed by Collins. Individual and group portraits were taken of the men who were preparing for their departure to the war in the Pacific. The photographs showed the rapport that Collins, described as larger than life, had established with the men. On a trip around the Pacific Ocean in 1953 he recorded Queen Elizabeth II’s visit to Fiji.