Two different cameras were used to cover the negotiations from Durning and Pacino's side. Lumet and cinematographer Victor J. Kemper relied on long shots to depict the point of view of the police, and the robbers' "entrapment". Lumet wanted to use the light available on the set to avoid additional luminescence. He fitted the bank with extra fluorescent lamps to achieve desired exposure, and he used other fluorescent lamps of lower power as fill light in close-ups. The film required seven nights of filming. Lumet needed the neighbors' cooperation for the use of their fire escapes to hold additional lights. The production was challenged by the weather, as temperatures dropped. On the day of the heist in August 1972, the temperature reached when the robbers entered the bank. The film was shot during the fall; to avoid having their breath be visible, the cast placed ice in their mouths to even out the temperature. Lighting was provided for the scenes by emergency vehicles, that were specially fitted with four 7,500 watt lamps. The white brick façade of the building provided light reflection. An existing lamp post was utilized, and its lighting reinforced to keep the crowd visible. Emergency lights were used on set in scenes where the power was shut off by the police.