Willfrye027
Member
I am considering picking up a demo tsn 662 to go with an extra eyepiece I have. I am wondering if this model has ED/Prominar glass, or if it’s just standard glass. I tried asking Kowa but the website form seems to be glitching for me. I have read various things on the internet ranging from “exactly the same as current 664M” to “standard glass” regarding this model. I have a 602 already, but if the 662 has ED glass I would be interested in comparing them. Thanks in advance!!