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Archive 2011 · ND 1000 filter coatings

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p.1 #1 · p.1 #1 · ND 1000 filter coatings

Is coating (single or multi) important on a ND 1000 filter? Wouldn't the filter, by its nature of being 1000, naturally reduce flare? Also, as I understand, that coatings allow more light to pass thru, wouldn't a coating defeat some of what you want a ND 1000 for in the first place?

Dec 01, 2011 at 06:27 PM
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p.1 #2 · p.1 #2 · ND 1000 filter coatings

no, an ND filter will not reduce flare because you are increasing exposure to compensate for the reduced amount of light. coatings are to reduce unwanted reflections and that doesn't have any bearing on the filter density.


Dec 01, 2011 at 06:36 PM
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p.1 #3 · p.1 #3 · ND 1000 filter coatings

As Herb said, no and no.

Flare is the result of reflections, has nothing to do with the absolute intensity of the light. Is the same pointing at the sun or a cigarette. All uncoated glass adds reflections, coated glass reduces the amount added.

Coatings do improve transmittance slightly (a few percent) but that really isn't the point most of the time, the issue is to reduce reflection. It just so happens if the light doesn't reflect then it transmits. As the ND 1000 is reducing the light by a factor of a 1000 the difference between a coated and uncoated as far as transmission goes would be for the ND 1000 (also a 3.0 in ND terms or 9.97 stops) with no coating around 1040 and with the coating 1010 (or ND3.02 vs ND3.0 or 10.02 stops vs 9.98 stops).


Dec 01, 2011 at 07:01 PM

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