Ricalton was a prolific photographer, leaving over 100,000 images, among them a large collection of stereoscopic images. He quit his teaching job in 1891 to become a professional photographer and war correspondent. For the next 15 years he photographed and recorded events such the Spanish–American War (1898–1899) in the Philippines, during the Boxer Rebellion (1900) in China, and the Russo-Japanese War (1904–1905) in Manchuria. When Ricalton tried to take pictures of Japanese soldiers in trenches during the Port Arthur campaign, he was held in custody until Major Yamaoka of General Nogi's staff confirmed that the American photographer could take pictures of whatever he wanted.