 Beyond the artistic aspects the film was technically advanced.Trnka used expensive Eastmancolor stock, which was "exceedingly rare for Czech productions of the period".Every scene was shot with two cameras simultaneously—one shooting Academy ratio, and one shooting in the then new CinemaScope format, effectively producing an in-camera Pan-and-scan version—all so Trnka could ensure that his widescreen production would not be presented letterboxed.