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Sony NXCAM NEX-FS700 CineAlta
4K EXMOR sensor with SDI, slow-motion recording.

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Old February 20th, 2013, 10:41 AM   #1
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How does the gain-feature work?

What is technically happening when I increase the gain value? Are just the numbers coming from the sensor multiplied by a processor with a factor (e.g. x8 for +18dB) or is there something changing on an analog level (e.g. increasing the supply voltage of the CMOS-elements)?
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Old February 20th, 2013, 04:20 PM   #2
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Re: How does the gain-feature work?

It will be either amplification of the analogue signal level before the A to D converters on the sensor chip or a digital gain math added to the digital signal in the DSP. The supply voltages to the sensor etc remain constant. I suspect it is most likely to be added to the digital signals in the DSP.
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Old February 20th, 2013, 05:50 PM   #3
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Re: How does the gain-feature work?

Quote:
Originally Posted by Alister Chapman View Post
I suspect it is most likely to be added to the digital signals in the DSP.
That would be great, because I realized that higher gain-values are revealing much more details in the shadows than lower ones (noise increases less with higher gain-values than useful picture-information). The gain-feature just being a computational multiplication would mean that the raw data from the sensor already contains all this shadow information independently from the gain-value. This would be one more hint that the 4k-raw-data from the FS700 will be awesome.
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