Chofetz Chaim Camera Conundrum

I have been rereading the ArtScroll biography of the Chafetz Chaim, written by Rabbi Moshe Yoshor and translated by Rabbi Charles Wengrov.

One of the puzzling things I found is that the Chofetz Chaim was camera shy, yet on page 507, in a footnote, we find the following:

Hidden in a chest drawer in his home, the Chafetz Chaim kept pictures of Rav Nachum of Hurodna, Reb Shimon Caftan, and Reb Mordechai of Lidda.  He would often take them out to look at them, and say to members of his household, "Children, you have no idea what great Jews they were.  They were concealed tsaddikim."