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I was a cinema projectionist for over 35+ years and worked in many theatres that had motorised top black masking that were on curved screens. These theatres were usually 70MM and that masking went up for 70MM. Its rather difficult to make movable top masking thats curved, especially in a smaller room where everything is quite close, unlike a real cinema.

I have a curved microperf Stewart ST130 150" scope screen with fixed top and bottom masking and motorised sides setup for 4.3, 1.66, 1.75, 1.85 and scope. I have always wanted to have movable top masking for when I screen 70MM films so the change looks dramatic as it did in the cinema. Has anyone here ever made motorised top masking on a curved screen? Its real easy for a flat screen but harder for curved....

The only way I know of is to have a long metal pole with a curve the same as the screen. The top masking has a pocket in the bottom to hold the curved pole, on the back of the fabric one uses festoon curtain tape with rings and cords to raise the fabric. There is quite a lot of work to do this nicely and motorised with a stop.

My question is has anyone done this a different way for a curved screen and motorised? I would love to know....
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