Excellent experiment and documentation from Njal Brekke that on Canon 1100D
Cooling the sensor below 0 °C gives virtually no improvement in noise level, even for ISO1600 and 10 minute exposures.
At exposure times shorter than 60 s the read-out (bias) noise is dominating, and the dark noise has negligible contribution to the total image noise.
Cooling to a modest 10 °C should therefore sufficient to eliminate dark/thermal noise at exposure values shorter than about 180 s.
At exposures longer than 180 s, cooling the sensor to 0 °C is sufficient.
This camera is using a 12.2 MP CMOS APS-C sensor.
Sensitivity test from DXOMark
Cooling the sensor below 0 °C gives virtually no improvement in noise level, even for ISO1600 and 10 minute exposures.
At exposure times shorter than 60 s the read-out (bias) noise is dominating, and the dark noise has negligible contribution to the total image noise.
Cooling to a modest 10 °C should therefore sufficient to eliminate dark/thermal noise at exposure values shorter than about 180 s.
At exposures longer than 180 s, cooling the sensor to 0 °C is sufficient.
This camera is using a 12.2 MP CMOS APS-C sensor.
Sensitivity test from DXOMark
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