Professor Larry Schaaf delivers the 2020 Colin Ford Lecture, providing a fascinating insight into his work on The William Henry Fox Talbot Catalogue Raisonne. There are approximately 25,000 Fox Talbot prints known worldwide, these range from crude experiments through to highly accomplished works of art. For more than four decades Professor Schaaf has been examining and compiling information on Talbot images worldwide. Beginning in 2014, with the backing of the William T Hillman Foundation, the Bodleian Libraries began converting these private databases into a public resource. So far, images and data of more than 16,000 images and data have been freely made available online, allowing researchers to pursue their own questions and draw their own conclusions.