I bought this filter two month ago, I have been told by an ad respondent that this IS NOT a premium filer due to transmission numbers. The numbers are as follows HBeta 94%, O3 486 NM 95%, O# 501NM 88%. I certainly cant charge full price if this is considered a second, although I paid full price from a very reputable dealer. I will accept offers if you are interested. I paid 189, but was not aware this is not up to standards. Let me know what you will pay. The filter is in excellent condition, used only a few times.