Homemade Telephoto Lenses: The Basics | Homemade Lens | Flickr
DIY camera lens tutorial | Homemade Lens | Flickr
Under $2 Telephoto Lens Tripod Mount : 4 Steps - Instructables
DIY: Making a Very Wide Angle Webcam on the Cheap - Scott Hanselman's Blog
How to Hack a ZOOM Lens on a Camera? | DIY Camera Hack | - dArtofScience - YouTube
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