Hoya CPL - rotate ring and oil?

Started Jun 8, 2012 | Discussions thread
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b4cktr4ck
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Hoya CPL - rotate ring and oil?
Jun 8, 2012

Hiya,

I just got a HOYA PRO1 CPL 67mm.

I have noticed that it has a rotating ring. (on the half part where the thread to screw on the lens is)
what is that for?

also there came out something that looks like oil from the middle, that has now stained the external part of the filter

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