Photography in the United States
In spring 1839, the daguerreotype was introduced into the United States by an Englishman named D.W. Seager, who took the first photograph of a view of St. Paul’s Church and a corner of the Astor House in Lower Manhattan in New York City. Painter and inventor Samuel Finley Breese Morse had met Louis Daguerre in Paris in the spring of 1839, becoming the first American to see his photographic process and becoming enamored with it as a result. When he returned to the United States later that year, he enthusiastically promoted the daguerreotype while hailing Seager's prototypical image. Morse had painted "The Gallery of the Louvre" in 1833, and the appeal of the medium of the daguerreotype was an obvious one to him: it was a means of making faithful copies of artworks, in addition to anything else that would be still in front of the slow eye of the camera.
Henry Collen
Calotype was an early photographic process developed by Henry Fox Talbot who was a colleague of Collen's. Talbot supplied the photographic knowledge and Collen the artistic know-how. In an article titled "Photography in the 1840s," Peter Marshall describes the distinction between daguerreotypes and calotypes. "The daguerrotype spread rapidly around the world...There were some limitations on the spread." Daguerre's process was somewhat limited by his prior patent in the UK, and so only those professionals who could afford a license were able to do so. Meanwhile, Talbot patented his calotype process in the UK and the US, but he was unable to get a patent in France which also limited its growth. Also, Marshall states, "In general, most professional photographers used the daguerreotype process in the 1840s, while the calotype was generally favored by those who were not attempting to earn an income." (A chart describing the differences between calotypes and daguerreotypes is included in the Appendix).