Yimou insisted on capturing natural reactions from the amateur actors. To achieve this, he often used hidden cameras and microphones. This resulted in a film-shot to film-used ratio of 35 to 1. Normally, because of cost, the ratio should be 3.5 to 1. However, because the film was shot on 16mm (an later blown up to 35mm), the price was about the same because of the cheaper film stock.