Passage: Principal photography had begun by January 21, 2017, at EUE/Screen Gems Studios in the Atlanta metropolitan area, under the working title Motherland. Filming also took place in the Sweet Auburn neighborhood in Atlanta, which doubled as Oakland; the High Museum of Art, which served as the fictional Museum of Great Britain in London; and Atlanta City Hall, which served as a United Nations building. Cinematographer Rachel Morrison, who was eager to work on Black Panther after working with Coogler on Fruitvale Station, first watched all of the other MCU films to understand the established "language". She wanted to "push" that language and feature more contrast in color. Visual effects supervisor Geoff Baumann provided Morrison with before-and-after shots of scenes from Civil War so she could understand what elements are captured on set and what is created digitally. She filmed in 3.4K ArriRaw with Arri Alexa XT Plus cameras and Panavision Primo lenses, primarily using a two-camera set-up with a third or fourth camera on occasion. Morrison said that lighting was her biggest challenge, the magnitude of which "was much bigger than I'd experienced before", and made extensive use of Arri SkyPanel LED light fixtures, which she could preprogram from an iPad. Some sets were completely surrounded by SkyPanels.Shortly after filming started, Kani's son Atandwa stated that he would appear in the film alongside his father, the latter reprising the role of T'Chaka, while on-set photographs revealed that Martin Freeman would reprise his role as Everett K. Ross. Marvel announced that production was underway on January 26, and confirmed the casting of Freeman, Wright, and John Kani, while revealing that Andy Serkis would reprise his role as Ulysses Klaue from Avengers: Age of Ultron. Atandwa portrays a younger version of his father's character, and also served as a cultural consultant during filming. Dialect coach Beth McGuire worked to ensure there was continuity between the various actors who had to use "Wakandan accents"....

Question: When did filming finish?
April 19, 2017