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In page Keoma (film):

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The film was shot over a period of eight weeks, with most principal photography being done at the Elios Studios in Rome, where Corbucci had previously filmed Django.[3] The studio's set was in dire need of repair, which made it easier for Castellari to film as they did not have to redress the sets.[2] The film was also shot on location at Lago di Camposecco.[2]