Spektroskop smartphone

A spektroskop for a smartphone. The first print I used red filament, but black filament will be better I think.
I used gaffatape because the box must be black inside.

You have to add a square piece of a DVD and glue it into the little window. This will work as at filter. The square piece must be transparent.
Maybe you have to cut a small line in the outer end of the spektroskop.

I build this spektroskop for a smartphone from a papermodel from Planetarium in Copenhagen i Denmark.

Try to see light from the sun or the yellow light from a steetlamp at night.