I think they refer to the photograph device and the thing to be photographed.
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vsureshI think they refer to the photograph device and the thing to be photographed.I didn't answer because I found the use of the two words puzzling, but the subject in photography is the thing being photographed. I still don't know what the writer means by "object".
Previously the author has explained a "subject" as being "author, reader, spectator or voyeur" and, for example, talking about a camera obscura, has said:
"we see the subject enjoying the image inside a tiny room, oblivious to the fact that he had to imprison himself inside this 'dark chamber' in order to see the image on the screen"
So, it seems that "subject" is the person lookin