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The first thing that strikes you when trying to do an evaluation like this is how fraught it is with your own preconceptions. I have no way of measuring the sensor's temperature directly as the cameras environment does not reflect the camera sensor temperature as the camera's own electronics heat up the camera internally. I first found out that the 5DH would not! do a 60 minute exposure at 1600 ISO!
Where to go from here? Here is a 4min exposure at 1600ISO and processed with ImagesPlus for conversion to Tiff and subsequent digital development at a standard level for all subsequent images. This will give you some idea of signal as opposed to noise.
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