Ueno Hikoma (15th October 1838-22nd May 1904) was a pioneer Japanese photographer from Nagasaki noted for his fine portraits, landscapes and that of Nagasaki and its environs. He first opened a photographic studio in Nagasaki in 1862 and later had branches of his photographic studio in Vladivostock in 1890 and in Shanghai and Hong Kong in 1891 according to wiki yet the notice below indicated he had closed business by August of 1889 in Hong Kong. He had an important working relationship with the famed Italian-British photographer Felice Beato, and was a commercially and artistically successful photographer during his career.
When exactly his studio was first established in Hong Kong is unknown at present so I've put the mid-1880s as a starting point. Any further information about his studio in Hong Kong please add below.