On the 25th of February in 1957, Mon Oncle had its last day of filming. They filmed about 6 months.
Kristin Thompson on the camera used to film Mon Oncle (thanks for the information I wanted to find for a long time): "It’s a blimp, a soundproofing device fastened around cameras so that the whirring sound they make while running won’t be picked up by microphones on set. It has holes for access to the main controls and a window for the lens. You can see the huge blimp that had to be used with Technicolor cameras, with Hitchcock shooting THE TROUBLE WITH HARRY, here (scroll down about halfway): http://www.widescreenmuseum.com/widescreen/wingvv3.htm