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DoWatt writes –

Everyone has at least one DVD they are ashamed of buying. You know, the DVD that was ‘a good idea at the time’, was watched half way through and then consigned to the back of the DVD rack, ‘hidden’ from prying eyes. This instructable makes some use of that mistaken purchase.

This idea came out of my need for a workable spectrometer to gather some data. Rather than looking to buy a commercial one, it was more useful (and cheaper) to build it out of the bits I had lying around. It turns out its fairly easy to use a CD for this purpose – but most of the older related pointers seemed to require you to build a box yourself, and in any case I wanted to use a DVD to improve the resolution.

Thus the idea of taking the DVD, case and all, to construct the spectrometer was born.

HOW TO – Naff movie into ‘DVD Spectra’ – Link.