There is quite a lot more on Degas and photography on the above-mentioned site, and I recommend you click around to different pages.
Four Dancers - c. 1899
Oil on canvas
Edgar Degas, French Realist/Impressionist Painter and Sculptor,
Source: Humanities Web
The painting above is one of those that was made with the help of photographs.
According to this article, although Degas had been interested in photographs three decades earlier, he did not take up photography himself until he was sixty-one years old. "[In] a burst of creative energy that lasted less than five years, [Degas] threw himself into photography for a short but intense period." There is much more in this article about Degas and photography.
This article, entitled "Camera Obscura," in Slate Magazine, is about the 1999 exhibition of Degas' photographs at the Metropolitan Museum of Art in New York and at the Getty Museum in Los Angeles. There are small photographs from the exhibit here, but although you are supposed to be able to enlarge them, it didn't work for me. Watch the video below on this page to see many of Degas' photographs.
Note 1: A Los Angeles Times article entitled Reframing Degas is also about the exhibition of Degas' photographs.
Note 2: Since writing this post on Degas and Photography, I've written another called Degas and Photography - More.
Note 3: Excellent article on Degas and photography. It is an article called "Dance to the music of time" in RA (Royal Academy) Magazine, Autumn 2011
Note 4: There are now four posts in this series about Artists and Photography. This on on Degas is the second. The first was about Delacroix. The third is on Vuillard and Photography, and the fourth is the second post on Degas and Photography, mentioned in the paragraph just above.