This document explains, step by step, how to make a small equipment that will adapt a diffraction grating on the objective of your mobile phone.
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Order your diffraction grating slide and go to the hunt of UFO’s spectrums. Several methods are available to get yours at low cost. The diffraction grating remains as free.
Fifty diffraction gratings are about to be delivered to Ukraine. A warm thank to the private groups from Eastern Europe who realized the importance of these free, easy to use small devices.
Sorry, this entry is only available in Français.