Originally posted by omega leader Estudleon,
Based upon the LensTip spectrophotometer tests the heliopan filters unfortunately aren't very good. And certainly not worth the money.
1- You are talking about the
UV filters test - Introduction - Lenstip.com
That inform doesn't refer to the incidence of the filter in the resolving power of the lens, that was the subject of my test.
How much Pl/mm can the Heliopan tansmit, based in the inform? We don't know.
2- Leica didn't know it, heliopan made some leica's filters (B&W made them too). Well, we can assume that LEICA didn't know very much about glasses (Schott ones).
3- 1- That not change the message : the negative effect of the filters over the lens optical complex.
The tests are very useful but they must be read and interpret properly.
Regards.