Napioa - Wind Origins

Napioa - Wind Origins
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The R72 has a filter factor of 16. Now a filter factor is a multiplier. We use this value by multiplying the exposure time without filter. Thus if the exposure time without filter is 1 second, then 1 x 16 = 16 seconds with the filter mounted. Alternately, the published ISO without filter is divided by the filter factor. If a film is rated at ISO 400 without ...


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I suspect metering will not be useful in that situation. The metering responds to visible light, which the filter blocks. The metering does not respond to infrared, which the filter passes. I think you are on trial and error. This article (with some experience) says compensate to about 9 stops down ...


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Perhaps the proper question is, what is the filter factor for the R72 filter. (how many stops of light does x filter block ) i am sure there is a general filter factor known for the filter but i do not know it. I would shoot the film at its rated ISO ( unless i have tested the film with my development and determined that another ISO gives better results ( ...


5

Based on your question at Mathematica.SE I assume that you simply summed up the integer values for each pixel in the raw file, and the total was greater than what you assume to be the number of incident photons. First, how do you know what is the actual number of incident photons and are you sure your estimate is correct? Assuming that your photon count ...


3

There are several things which one should take into account to answer this question: no camera may generate 1 electron per 1 photon across wide range of wavelengths. Example of monochrome IR-sensitive sensor efficiency. Bayer colour sensing camera is based upon generating less photons in response to certain wavelengths. Spectral response of D3 with IR ...



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