DIY 3rd Party Lens Mount for NIKON D90 using DSLR body cap. | *DIY Photography Equipment | Flickr
This DIY camera attachment to hold 2 camera lenses together in the wrong direction. This either gives my zoom a 0.2X or 5.12X multiplication. (0.43X and 2.2X for $10 each) : r/functionalprint
How to Make a Telephoto Camera Lens Out of an Empty Pringles Can | PetaPixel
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Build a Super Telephoto Lenses w/o Using a Camera Lens: DIY and Photo Experiments Forum: Digital Photography Review