The Angelus Studio was a professional photographic company located in Portland, Oregon. The collection includes works by George M. Weister (1862–1922) and Arthur M. Prentiss (dates undetermined) among the studio photographers; owner Fred Clark also acquired images by previous local photographers including Partridge. The Angelus Studio collection provides extraordinary documentation of the city of Portland, the Lewis & Clark Exposition of 1905, Oregon landmarks, Columbia River, and commercial operations including logging and fish packing.