If you are a camera fan, I mean have a willingness to go beyond the pocket size digital cameras, you know that the optical lenses are bloody expensive. All this time it didn't make scenes to me why. Because an optical lenses looks like a very simple gadget with few lenses, few metal rings etc.

Just found this video in YouTube and now it makes perfect scenes why those are so expensive. Even though the final product is a simple one the process of making it is not simple at all. Impressive!

BTW: this is the first YouTube I'm putting in my blog