Next you will adjust the zoom on Adobe Acrobat to make sure that the pattern pieces being projected will be the correct size. The Facebook group, Projectors For Sewing has a lot of information that will help guide you through this process, which has kindly been provided for free by the page admins. It includes several calibration grid files, which you can download and bring up in Adobe Acrobat. Here is a screen grab of my laptop displaying one of the calibration grids that can be used. Each line is a certain length as indicated on the grid, and your projected image has to be adjusted so that the projected line measures at the correct length.
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