Infoseite // Automatic ND filter - how?



Frage von Auf Achse:


How does an automatic ND filter works like it as a.derCanonXF100 / or XA10 was then installed in the HV20-40? In my opinion this must somehow work in the electronical signal processing, because a mechanical swinging a filter I could not see before. \u003cbr /\u003e\u003cbr /\u003e Thanks + Regards, \u003cbr /\u003e On the move

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Antwort von WoWu:

The XF100 has a graduated ND filter \u003cbr /\u003e http://www.bhphotovideo.com/c/product/733533-REG/Canon_4888B001_XF100_HD_Professional_Camcorder.html \u003cbr /\u003e\u003cbr /\u003e This is a filter which increases in its impermeability. In most cases, a disc front of the sensor (in the light cone) is twisted. Because the sensor is only 2.9 mm high, the whole slice is tiny. Because it is in Unschaefebereich the sensor moves, falls one by the increase a.ND uneven scattering effect does not occur. \u003cbr /\u003e From Aperture 4 then is screwed in the ND and the aperture stops, so as not to get through the diffraction blur. \u003cbr /\u003e\u003cbr /\u003e Another alternative, we operate as Protyp. Two polarizing filters, which are sitting in a motor housing of the aperture and the camera electronics twisted. Works automatically synonymous. With the then established

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Antwort von Auf Achse:

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Antwort von WoWu:

Yes, exactly, except that we just do not do it with GREY but with the light phase.

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Antwort von Auf Achse:

Thank you! \u003cbr /\u003e Can your Polfilterprototyp synonymous in poor light conditions remain swung? Is to say he is synonymous set so that he (almost) absorbs no light? For Comparison to a Vario-ND swallows synonymous with the lowest gray level light. \u003cbr /\u003e\u003cbr /\u003e Best Regards, \u003cbr /\u003e On the move

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Antwort von WoWu:

We use two linear filters that are making absolute phase. For most vario NDs are in it due to cost circular filter, which works for the not so good. \u003cbr /\u003e But each glass, synonymous with no filtering action absorbs light. \u003cbr /\u003e Therefore, the filters are always in there, if a special application that requires ... (In this case, the dynamics of light) Otherwise, if a conventional ND goes, has always preferred because it is much better.

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Antwort von domain:

Barry Green has the built-in ND filters once wrote the following: \u003cbr /\u003e\u003cbr /\u003e \u003cspan style=\

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Antwort von Auf Achse:

Thanks for your info! If there are in the XF / XA / ND filter HV correct then it should be swung out when not in use from the beam path. Only at the first stage of ND he would be swung because if he remains synonymous splashing around when not in use, he would still swallow light. It would give away in this manner Lichtstaerke. At that time I noted in my HV40 but not swinging. \u003cbr /\u003e\u003cbr /\u003e If the ND but a similar structure as the of WoWu he could stay inside and away little Lichtstaerke. Probably as a will be. \u003cbr /\u003e\u003cbr /\u003e On the move

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Antwort von domain:

Why should such a tempered filter swallow more light than any of the many lenses in Objectively, or even the OIS design? \u003cbr /\u003e A swinging does not have to be observed directly, you can read the filter as a perfectly clear glass discs initially imagine that more and more with his growing stain turns into the beam path and indeed borderless and continuous.

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Antwort von shipoffools:

The exact function is \u003cspan style=\

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