I have read Barthes only in translation, perhaps he fares better in French.
Still. Camera Lucida reads like a wildly self-indulgent mess, which boils down to "I, Roland Barthes, am terribly sensitive,
and see profound things in what you might consider a trivial snapshot"
studium and puntum are the string theory of photography, they are ideas that lead nowhere. I have literally never seen them mentioned except as a form
of name-dropping (which occurs constantly) and anyways not only is Barthes the only person ever who seems to actually perceive photographs this way
(but then, see above, it strikes the cynical reader that even this is probably a sham) but the things he calls out as examples of "punctum", asserting that they
are trivial details the photographer would not himself have noticed, are exactly the kids of things a photographer *does* notice. The woman's shoes.
His notion of "blind field" is considerably more useful, but I think he lifted it from his cinema friends.
The rest is pretty much warmed over Sontag. As these things tend to be. While she was certainly a self-indulgent snob, she wrote down a lot of the basics tolerably well.