YouTube user uyt384 does tests on old camera lenses, but not in the way you’d expect. Instead of testing the build or image quality, he uses a Geiger counter to see how much radiation is being emitted by each one.
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Andrew Lathrop came up with this novel way of building a simple radiation detector using an old compact camera, plastic scintillators, some reflective material, and black tape. A scintillator is material that lights up when exposed to radiation, and might be a little difficult for you to get your hands on unless you work in a science lab. Lathrop sent his idea to newspapers in Japan after the recent earthquake, but none of them decided to publish it.

(via PopPhoto)