The phrase "the birth of photography" has been used by different authors to mean different things - either the publicizing of the process (in 1839) as a metaphor to indicate that previous to that the daguerreotype process had been kept secret; or, the date the first photograph was taken by or with a camera (using the asphalt process or heliography), thought to have been 1822, but Eder's research indicates that the date was more probably 1826 or later. Fox Talbot's first photographs, on the other hand, were made "in the brilliant summer of 1835."