Lens coatings have nothing to do with whether or not an optic has field flattening technology, zero.
Correct. It's the glass grind.
Brad, JG, FTR,
No it is not exclusively glass. I had this conversation with Swaro a few years ago when I mentioned field flattening lens, and it was politely explained to me lens coatings are part of the equation. Although I was wrong to omit lenses are part it too.
