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
Markus Keinath - Super Fast Tele Photo Lens - Focal Reducer
How to Make a Lens from Scratch (Like, Literally Rocks and Sand)
Build a Super Telephoto Lenses w/o Using a Camera Lens: DIY and Photo Experiments Forum: Digital Photography Review
Hot~12X Zoom Optical Telescope Camera Lens Party DIY Photography Zoom In Supplies Telephoto Lens Clips For Mobile Phone - Walmart.com
Build a Super Telephoto Lenses w/o Using a Camera Lens: DIY and Photo Experiments Forum: Digital Photography Review
Under $2 Telephoto Lens Tripod Mount : 4 Steps - Instructables
Diy 3mp 1/2.5" 3.6mm 90 Degrees Angle View Cctv Fixed Ir Board Camera Lens M12 Mtv Lens Mount Screws For Analog Ip Camera Module - Cctv Lens - AliExpress
DIY Telephoto lens support – Part II – Filip Ghinea | Photography Chronicles
DIY camera lens tutorial | Homemade Lens | Flickr
Telescope 30x zoom with DIY Barlow lens - YouTube
How to Hack a ZOOM Lens on a Camera? | DIY Camera Hack | - dArtofScience - YouTube