Los Angeles, and particulary Hollywood, remains the historic capital of cinema. Regarding the art market, the situation is different. As the city grew and became richer, it gradually gained collectors. When did this movement really develop ? Who played a role in the developpement of this art market ? How was Impressionism then considered ? An historical outlook and a description of different collections will allow us to present some answers to these questions. This will raise another one: since the collectors are also often from film industry, what kind of relationship do they have to impressionist works? How to consider the circulation from one medium to another?