If you want to have a masking system for your fixed frame projection screen, you have to pay a lot of money.
Often even more for the system then for the screen itself.
In this video, you will see an overview of how a DIY masking system works. And..it’s one that you can make yourself for a few hundred dollars. That’s because it uses one elctric motor only and.. it uses standard components.
Have a look for yourself. It’s part 1 of 2.