Problem with heliopan uv

Hi everyone,
I bought a heliopan multicoating uv filter (sh-pmc) and thinking there are some quality issues with it.
When looking through the light (with an angle) some strach like smudges appear on it.
After some cleaning attempts i was unsuccessful, then i replaced it with another one from the dealer but observed the similar smudges !!!
I've read about that multicoated optics show every defect,dust,smudges easier than single coating due to low reflection characteristics.
Is it normal for a brandnew unit?
I have 2 b+w filters(single coating) and they seem perfect when looking by the same method..

atx880 wrote in post #5654024
Hi everyone,
I bought a heliopan multicoating uv filter (sh-pmc) and thinking there are some quality issues with it.
When looking through the light (with an angle) some strach like smudges appear on it.
After some cleaning attempts i was unsuccessful, then i replaced it with another one from the dealer but observed the similar smudges !!!
I've read about that multicoated optics show every defect,dust,smudges easier than single coating due to low reflection characteristics.
Is it normal for a brandnew unit?
I have 2 b+w filters(single coating) and they seem perfect when looking by the same method..

therein could be your answer. i use hoya, kenko and B+W and i've never seen any marks on the glass.

ed rader