In 1889–90, aged 30, he made the first of two self-financed excursions to the Caucasus. His photographs from both the Alps and the Caucasus reveal how adept he was becoming at using the human figure to give scale to his vast landscape compositions. He also recorded the people he met and who gave him hospitality. By the end of the century, he was ready for the Himalaya. He joined the British explorer Douglas Freshfield for a circumnavigation of Kangchenjunga, the 3rd-highest peak in the world, and one that remained unclimbed until 1955.
Kangchenjunga is a great mountain not only in height but in presence, and the excited Sella responded with an exemplary set of prints, helped by the way a recent snowfall had dusted the mountains with the Himalayan equivalent of make-up. This was a superb introduction to the highest abodes of the world, as the mountain lies between India, Nepal and Tibet, so vistas opened up into every country.
By far the most important connection for Sella was his early friendship with the Duke of the Abruzzi, the grandson of the Italian king. A decade or so younger than Sella, the Duke was likewise a man of extraordinary energies with interests in exploring the Arctic as well as the mountains. In 1897, he effectively became Sella’s patron and went on to fund three important expeditions in which Sella would take part both as a mountaineer and even more importantly as the photographer of record.
He was documenting the scientific aims of the expedition in a thorough and conscientious way, one that he enhanced with his aesthetic appreciation. It could be said of Sella that he was incapable of framing a poor composition, whether it be a mountain, person or tree; and that he had the quality of facilità which was so praised in Renaissance Italy, of producing pictures which appear complete but are not overfinished—that are at ease with themselves.