I like this video from John Dobson about handmade telescopes, where he builds a complete telescope including hand grinding the mirrors. https://www.youtube.com/

I like this video from John Dobson about handmade telescopes, where he builds a complete telescope including hand grinding the mirrors. https://www.youtube.com/watch?v=snz7JJlSZvw https://www.youtube.com/watch?v=snz7JJlSZvw