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This reminds me of this Kickstarter project that I backed a while back: https://www.kickstarter.com/projects/968523355/micro-phone-l...

This one just sticks to your phone rather than requiring an enclosure, but only has a max zoom of 60x (or 15x without phone zoom).

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'Phone zoom' is all software, so it wouldn't be true 60x.

That depends on the phone.

Some Nokia devices (for one example I know of: no doubt there exist other cameras and camera phones that do something similar) have a higher resolution CCD than they need for unzoomed images and use the extra resolution for noise reduction and such when scaling the image down to the final size - so with zoom you genuinely get more detail but possibly at the expense of extra signal noise.

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