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A bias frame records the random noise contributions from the sensor's on-chip amplifier. To take one, you set your camera to the shortest exposure it can take.
A dark noise is a measure of the noise generated by the chip over the timeframe of a light exposure. However when you take a dark frame you are including a bias measurement anyway. Depending on what you are doing with the image then just a dark frame may be all that is necessary without taking a seperate bias frame.
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