I wanted to take some shots from my phone using diffraction gratings to compare the light spectrums of different luminaires, after purchasing 3 gratings of 100, 300 and 600 lines, I needed something that would allow me to arrange the grating as a filter in front of the camera and store the remaining ones so as not to lose them between changes, so I designed this support for the smartphone and the remaining grilles with a pin to hold the grille in use in front of the Smartphone camera and the remaining ones in a container, the result has been practical For my use, I just need to finish off the dovetail mount with a ¼ thread insert, so I can screw it onto my tripod or my telescope (maybe?). I leave some results of photos taken so that its use is better understood.