>>3919940Also forgot to mention, I made my own lenses for a microscope a few years ago. It was easier than normal lenses.
Used PDMS resin on the bottom of a slide to get a curve using the surface tension, and as it dries clear, it worked quite well, but of about 50 drops I got maybe three usable products.
Relevant picture taken with homemade lens
For a bigger lens you'd have to find a more viscous resin
Make a form for the curve and grease it.
Put it into a container like an egg poaching ring
Vibrate to get bubbles out
Polish with headlight cleaning paste