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She favored gelatin silver bromide before finally learning platinum printing, the Photo-Secession’s accepted process, during her time in New York.

Two photography dealers have teamed up for an exhibition dedicated to the Photo-Secession, the group founded by Alfred Stieglitz in 1902 to promote photography as an art form in the United States.

The National Gallery’s vastly greater financial power has allowed it to collect synoptically, and the first of the exhibitions — “In the Light of the Past” — is essentially a primer in the history of the medium, from early images captured in the 1840s through the age of the daguerreotype, the experiments of the “Photo-Secession” and other avant garde movements, the use of photography for science and exploration, into the great age of post-World War II documentary and social issues photography.

In 1928 this Photo-Secession pioneer donated 22 of his own works to the Met.

De Meyer’s beginnings in photography coincided with those of the various Photo-Secession movements in New York, London and Vienna, which all fought hard for photography’s place in the realm of fine art.