What does it all mean. Zeiss says their bins have superachromats, Leica has an HD glass and an HD APO. Is any of this better than others when it comes to binoculars or is it all hype to help sales. I would like to know what it all means. Thanks.
I would start by calling Zeiss for that information.
There were some excellent discussions on HD, ED and FL style glass here in the binocular forum some time within the last year. Some of the regular members did an excellent job of explaining much of it. Maybe one of them remembers which thread it was under and can direct you to it. I seem to remember it being in one of the subforums but I could be mistaken.
Sorry I could not help more but this is definitely an excellent question to get clarification on.