DIY Telephoto lens support – Part II – Filip Ghinea | Photography Chronicles
General Use F290 Diy Projector Glass Lens For 10-12 Inch Projector/projection Diy Home Cinema Rd-806 Lens - Accessories - AliExpress
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