نقل قول:
I contacted Marumi and a very detailed response was returned by the General manager at Marumi which answered all my questions in detail, here is that response:
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Please find our comments in reply to your questions as follows:
1.Marumi DHG ND100000 filter has been developed for the purpose of photographing solar eclipse by a still camera.
2.It conforms with the camera filter safety guideline published by astronomic education organization in Japan which says
that for the safety of sun observation the sun light transmission rate should be less than 0.003% at visible light area
(380nm - 780nm) and less than 0.5% at near infra-red area (780nm - 1,400nm). Even so, the guideline warns that
it does not guaranty the safety if within guideline as the figures are logically calculated based on long time sun observation
without taking a risk of damaging the human eyes.
As you can see in the attached transmission rate graph of our ND100000, it has the characteristic far above the guideline.
Therefore,
(1)Live view shooting in normal condition should be no problem. However, there is no guaranty of safety for long time shooting.
(2)The sun light coming through this filter should be safe enough for human eyes and camera sensors but it may depend on
individual conditions and please avoid long-time continuous use.
(3)Does this filter reduce IR emotions equally to the visible light reduction?
No. As you can see in the attached transmission rate graph, the light reduction rate is even up to 800nm area but beyond 800nm,
the light reduction is not the same as for visible light.
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