37mm Close-Up Lens Adapter for Acer K132/K135 projector
thingiverse
Disclaimer: Use at your own risk. I am not accountable for any harm caused by the use of this item. This adapter was created specifically for David SLS 3D scanning purposes. By incorporating a close-up lens, it's possible to significantly reduce the distance to the screen or object being scanned. The solution was thoroughly tested with an Acer K135i projector and various close-up lenses of factor 1x, 2x, 4x, 10x. Data on measured distances to the screen and corresponding screen sizes can be found in a table accompanying this notice.
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