If you’ve used a diode laser engraver or cutter, you know that focus is critical. You’d think it would be relatively simple to get a sharp focus, but it isn’t that simple. [Makers Mashup] shows in a ...

He used the internal disk portion as an infrared filter to obtain some striking photos. In all honestly, the results were not as nice as what you get from a very expensive professional filter.

Did you ever wonder how it is to see beyond the visible spectrum? Explore how to use near-infrared (IR) to take pictures with your phone.