Why does the perceived sensitivity of the SI-2K change with different white-balance settings?
The sensitivity of the SI-2K differs because the white-balance is accomplished through a digital, not analog gain on the RAW data. This means that the sensor’s RAW data is being adjusted digitally for the optimum white-balance, rather than before the A/D converter. This gives us the flexibility to adjust the white-balance in post because the RAW data itself from the camera does not have a non-reversible white-balance “baked” into the image. The applied digital gains though will affect the perceived luminance sensitivity of the camera due to the fact that luminance is a weighted sum of red, green, and blue, so as the different channels are gained up and down to achieve an optimum white-balance, there will be a different luminance value for a given desired middle grey subject. The SI-2K is most sensitive to red light, so the perceived sensitivity of a middle grey subject will be higher under tungsten lighting than daylight. The important thing to note is that since the white-balance is m
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