From Cooktop to Optical Part

This video shows how you can use the material from a cooktop to make zero-expansion glass-ceramic optical parts. CONTENTS 00:00 Intro 00:22 On glass-ceramics and thermal expansion 02:25 Cutting, grinding and optical polishing of Ceran and Robax 10:15 Optical configuration of a Newtonian telescope 12:18 Making a flat secondary 18:37 Making a parabolic primary mirror 30:40 A quick look through the "telescope" 31:54 Outro LINKS: Some images used are copyright of Schott, ESA and the Max Plank Institute: https://www.schott.com/en-nl/expertis... https://elt.eso.org/mirror/M2M3/ https://www.mpia.de/institute/researc... DOWNLOADS: DFTfringe Interferometry software by Dale Eason: https://github.com/githubdoe/DFTFringe MUSIC: 08:25 "Sizzr" by Schwartzy taken from the Youtube music library 21:10 "Pump up the Jam" by Technotronic (short clip from    • Technotronic - Pump Up The Jam (Official M...  ). According to those in the know,THE most influential musical milestone of the 20th century:    • Every 'Pump Up The Jam' Segue - Philomena ...   31:54 More to light by the Earlybirds and Liam F. (Trippy Joint Remix by Jerome) Special thanks to all Patrons who support the channel! Did I forget to mention you here? Please let me know and I will set it straight