Hoya filters with PNC coating - what is PNC?

Discussion in 'Accessories' started by Colin O, Apr 25, 2020.

  1. At the end of the Hoya filter catalog <HOYA | Downloads>, in the filter size list, there is some info on coating. Some filters in the "PRO ND Series" are listed as having a "PNC" coating. Can anyone tell me what PNC means? Could it just be "Pro ND Coating"?? If that's it, it seems pretty meaningless to me.
  2. SCL


    Nano Coating
  3. I didn't read the catalog/brochure carefully enough - there is a page explaining the different coatings. It says:

    PRO ND coating is the coating which had reduction of reflectance, and a neutral damping characteristic to the broadband. PRO ND coating is given to both sides of the polished glass, and the filter is assembled with structure with few optical leaks.​

    ...whatever that means!
  4. SCL


    Pro ND filters are Hoya's Pro line of neutral density filters. The PNC is a relatively new technology incorporating nano coating particles, which substantially reduce reflectivity.
  5. Nano coating usually means they don’t get so dirty, and if/when they do it is easier to clean. The multi coating properties of reducing flare will be much the same as a non nano coated lens. It’s worth having on a filter you use a lot, but otherwise may not be worth the extra.
  6. So, err, why did Nikon only use nano-coating on the inside surfaces of their lenses during its early development?

    Nikon also clearly state that nano-coating is used for its superior anti-reflective properties.
  7. They're that too, but my understanding is it usually means they're easy to clean. It is indeed possible that the nano for low surface tension (easy to clean) is different from the nano for improved coatings. I like the easy to clean nano, the other I take with a grain of salt since improved coatings are a fail safe claim said of all new lenses.
  8. I don’t know about filter nano coating, but Nikon lens nano coating is supposed to be great at reducing reflections, but also soft and easily damaged. So they put it on the interior surfaces that are not meant to be cleaned by the user.

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