 Sholay was the first Indian film to have a <unk> soundtrack and to use the 70 mm widescreen format . However , since actual 70 mm cameras were expensive at the time , the film was shot on traditional 35 mm film and the 4 : 3 picture was subsequently converted to a 2 @.@ 2 : 1 frame . Regarding the process , Sippy said , " A <unk> [ sic ] format takes the <unk> of the big screen and <unk> it even more to make the picture even bigger , but since I also wanted a spread of sound we used six @-@ track <unk> sound and combined it with the big screen . It was definitely a <unk> . " The use of 70 mm was emphasised by film posters on which the name of the film was stylised to match the <unk> logo . Film posters also sought to differentiate the film from those which had come before ; one of them added the tagline : " The greatest star cast ever assembled – the greatest story ever told " . 
