First movie to conquest of Istanbul

This is a First movie to conquest of Istanbul but a lot of people doesn't know it.(also Turkish people)
Istanbul, who was name a Constantinople in the Byzantine Empire, was conquered by Ottoman Empire on Tuesday, May 29, 1453.This is the most important war in the world history.Fatih Sultan Mehmet(or Mehmet II "the Conqueror") was told by " Istanbul'un fethi (1951)"
This movie tell about this important event.(prepation and siege)
It's old Turkish film but nobody knows it!It's a very tragic..

Onur(betatron) Coban