The camera is doing the work of recording the image, although certainly the human operator is doing the work of composition, lighting, etc. The fact remains, no matter how much human work goes into every other aspect of producing the photograph, the camera is the object that is capturing the image.
Edit: not to say that I think this is a relevant factor! No more than the computer recording the keys you type or producing the physical printed page should be relevant for a book's copyright.
Right. It's not doing "all the work" as the parent said. (Not to mention the editing process that comes afterwards!) Indeed, some photographers distinguish the two as "taking" a photograph versus "making" a photograph.
Edit: not to say that I think this is a relevant factor! No more than the computer recording the keys you type or producing the physical printed page should be relevant for a book's copyright.