Man! How the hell do they polish that?
#13 Since it is in Chile I am guessing with chili powder....
We looked into making our own 8” mirror so the kids could see Halley’s Comet back in 1986. The basic grinding process was simple. As you got closer to the final surface shape, you had to wet the surface to make it reflective, then look at a sheet of graph paper placed several feet away.
Any mirror distortion was evident in the reflected image.
Once the reflected image was correct, you had to send the mirror off to have it coated.
We ended up buying an 8” silvered mirror and constricting the rest of the telescope.
http://www.scopemaking.net/mirror/mirror.htm
HiLIARy with a cloth?
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