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Hoya filters with PNC coating - what is PNC?


Colin O

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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!

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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.
Robin Smith
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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.

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.

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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.
Robin Smith
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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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