Although LACMA's photo collection encompasses the entire field, it has many gaps and is far smaller than that of the J. Paul Getty Museum.[84] In 1992 Audrey and Sydney Irmas donated their entire photography collection, creating what is now the Los Angeles County Museum of Art's Audrey and Sydney Irmas Collection of Artists' Self-Portraits, a large and highly specialized selection spanning 150 years. The couple donated the collection two years before a major exhibition of the collection was mounted at LACMA; the display included photos of and by artistic photographers ranging from chemist Alphonse Poitevin in 1853 to Robert Mapplethorpe in 1988.