Shots of glass. Shots of nature. Shots of engineers. Shots of nature. Shots of glass. Shots of nature. Japan!! This is how SIGMA lenses are made!
Related Posts
Shots of glass. Shots of nature. Shots of engineers. Shots of nature. Shots of glass. Shots of nature. Japan!! This is how SIGMA lenses are made!
[...] use of lanthanum and thorium to reduce the index of refraction. Of course, nowadays, you can just grow the perfect [...]