Has anyone seen the Mike Leigh movie, Mr Turner (with Timothy Spall in the lead role?)
There is a great section on the growing threat (perceived by Mr Turner at least) that the new photography (using camerARs) poses to artists and painters. It is quite humorous, although probably not meant to be overly funny. There is quite an interesting line in response to Mr Turner's question about why the pictures aren't in colour ... the photographer says that it was a mystery why the daguerreotype images weren't in colour.
Anyway, worth a watch if you get the chance. The film is good all the way through, even if they filmed the Margate sections in Cornwall rather than in Margate.