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Use a laser pointer to create a macro lens
By dissecting an old laser pointer and removing the focusing lens from within, you can attach this in front of your smartphone camera's lens using little more than some duct tape and a hairpin. Try zooming in now -- and enjoy your makeshift macro lens.
HELMUT Film Scanner
The Helmut film scanner, available on Android, transforms your phone into a photographic film scanner. When you capture images through the camera or alternatively store them in a gallery after shooting them with a DSLR, save the frame using the Helmut application. Crop, tweak, and use a number of color balance tools after the scan to digitize your old negatives.