The lead-free arsenic-free glass allows for non-distorted light, which is allegedly more perceptible and usable by the human eye. Carl Zeiss started making lenses in 1846. All the bombing lenses on the German bombers were the best in the world and still are.
Bc, my consideration on zeiss is based on what I see and what eye doctors tell me. I have one in the family and all his comrades in the buisness have Zeiss equipment also. I would'nt go to a gun store and ask the guy behind the counter what he taught on this subject.
I can care less what the other guy wants to buy, to each his own. I'm not going to buy something justbecause it's popular. I understand, a man has to buy what he can afford.

Sniper, if I offened you in anyway, I apologize!