The blockbuster film "Interstellar" has made it a box office success, earning over $700m worldwide.

The film director opted for old-fashioned technology when it comes to putting his film on the big screen.

But the time-honoured analog film-making is being replaced by digital format and almost 95 percent of theatres across the US have converted to digital projectors to show films.

Al Jazeera’s Kristen Saloomey reports from New York.