Double-convex lens buying tips

[JSpiner]

Double-convex lens is pretty expensive. In amazone, it costs $11.49 + extra delivery fee : amazone link Lenses are about $4 each on AliExpress, which sells things cheaply, but there are no exact specifications, and shipping takes a long time.

I found a tip to get lenses easily, and cheaper. Google Cardboard 2.0 features a 37mm double convex lens. So if you buy one of these, you can get two 37mm or 42mm lenses for less than $7. https://www.amazon.com/Multiple-Complete-Google-Cardboard-VR/dp/B08MW1NWF4/ref=sr_1_1?keywords=google%2Bcardboard%2Bv2&qid=1682125781&sprefix=google%2Bcardboard%2B2%2Caps%2C265&sr=8-1&th=1 Cardboard is much cheaper in Korea. You can get it for around $3.50. You can also get it on AliExpress for a similar price.

It would be nice if this tip was added to the wiki.

[JSpiner]

if you using 42mm lens, you should modify STL files. The easiest way is to modify the lens cover.

This is sample : lens_cover_for_42mm.zip