Making a monolithic telescope Part 3: Figuring & Testing

Use the following links if you want to skip to the next chapter of the video: 00:00 General intro 01:54 Required level of precision 07:12 Measuring surface shapes with interferometry 10:46 Fringe evaluation with DFTfringe 12:12 Optical Pitch polishing 17:19 Making molds using 3D printing 18:18 Results with variable surface tools 21:06 Primary mirror 22:20 Point Diffraction Interferometry (PDI) 26:48 Visual performance 29:58 NO MORE NAPS (featuring Dr. Fullersheit) Links mentioned in the video: Website with the best and most detailed information on telescope optics: The 3D-printer used was manufactured by 3Bfab. More information on their products can be found on their website: (not sponsored content - they did neither ask nor pay me to show their product)