How to Build a Cheap and Easy Optical Zoom Lens for Your Smartphone « Photography :: WonderHowTo
Telephoto Lens,420-800mm F/8.3-16 Super Manual Telephoto Zoom Lens,Full Manual Focusing Zoom Telephoto Lens for SLR Camera Far Distance Photography,for Sports Matches/Wild Animals/Concert: Amazon.co.uk: Electronics & Photo
DIY Homemade Magnifying Glass Lens - Make a Lo-Fi Lens with a Magnifying Glass and a Macro Tube! - YouTube
booleansplit.com » DIY
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
Building A Motorized Zoom Machine For Your DSLR - YouTube
How to Turn an Old Kit Lens into a DSLR Macro Lens in Five Minutes « Photography :: WonderHowTo