All 4 Uses

candid
in
The Phantom of the Opera
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I was at first inclined to be suspicious; but when the Persian had told me, with child-like candor, all that he knew about the ghost and had handed me the proofs of the ghost's existence—including the strange correspondence of Christine Daae—to do as I pleased with, I was no longer able to doubt.†
Chpt Prol. *
As a matter of fact, petted as he was by his two sisters and his old aunt, he had retained from this purely feminine education manners that were almost candid and stamped with a charm that nothing had yet been able to sully.†
Chpt 2
He did not know what to say in the presence of this candid and perfect faith in a genius who came down nightly from Heaven to haunt the dressing-rooms at the Opera.†
Chpt 8
You have taken a shameful advantage of the candid affection of your benefactress herself, who continues to believe in your sincerity while you go about the Opera ball with Red Death!†
Chpt 9

Definitions:

(1) (candid as in: your candid opinion)
honest and direct
(2) (candid as in: a candid photograph)
unposed -- typically said of a photograph
(3) (meaning too rare to warrant focus)