Helsinki remained Inha's hometown for most of his life, but in addition to places he visited on his numerous travels, he spent some years in the villages of Karjalohja and Lohja in southwestern Finland.
Alongside famous Finnish artists like Jean Sibelius, Juhani Aho, and Eero Järnefelt, Inha was an integral part of the artistic movement what is nowadays called the golden era of Finnish art in the turn of the 20th century.
In 1889 Inha traveled in Europe and studied photography in Germany (in Bad Grönenbach with W. Cronenberg) and Austria (in Vienna at the E. Jaffé and A. Albert atelje).
His travels included several trips to northern and eastern Finland and even a grand tour during which he drove his bicycle through the whole country in 1895.
Due to his activity and productivity Inha slowly became the single most significant photographic documentarist of the Finnish landscape and countryside.
Inha was a prominent journalist and worked for the Finnish newspaper Uusi Suometar for almost twenty years (1888–1906) as an editor of foreign affairs.