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  1. Hi All,

    I just picked up a B&W Circular Polarizing filter for my (77mm threads) 17-55mm f/2.8. I also picked up a 67mm-->77mm converter so I can use the new CPL on my 70-300 VR instead of the cheap CPL I previously had (SunPak: <$20).

    Question: What is a typical f-stop loss with a CPL? (is it ~2 stops?) I don't really want to spend additional $$ on a neutral density filter. Is there anything stopping me from using this CPL as a neutral density filter (excuse my lack of knowledge), or should I really pick up a neutral density filter for bright days when I want a wide-open aperture?

    Thanks
     
  2. I could be wrong, but I 'think' different CPL will have different light stopping abilities - just from the way different manufacturers make them, with cheaper ones stopping more light. The Nikon CPII that I have certainly lets in more light than the old cheap Hoya one I had a few years ago.

    A CPL isn't a ND replacement though, so if you need to stop a lot of light then that is still the way to go.
     
  3. I found the specs for the B&W Filter that I bought. It states a reduction of 1.3 stops of light. I guess a "typical" ND filter is ~3 stops? Am i correct in stating that?

    Edit: I see they are available in many different stops. I think I'm clearer now. Thx.
     
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