>>3034902So he is like man made global warming scientists, and Al Gore.
Actually it is not all that complicated. I have ground glass for years for my other hobby astronomy. I have done both refractors, and mirrors, as well as made a few eyepieces. You just decide what you want to do, and that determines the figuring of the glass. Also you select the glass elements that cancel out the aberrations of the previous element. You can correct fairly good without any coatings.
