What causes a camera image sensor to heat up, and does Live View increase sensor temperature?
Asked 8/7/2012
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I understand that an image sensor can warm up during long exposures, but what are the main causes of sensor heating in general? Is it mostly from light falling on the sensor, or from the sensor’s own electronics during readout and processing? Does the amount of heating differ between sensor technologies such as CCD and CMOS? Also, does using Live View make the sensor run hotter than normal still-photo shooting?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
14y ago
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An image sensor is basically a small computer chip, and have similar heating characteristics. When transistor gates switch from on to off, or the other way you have small electrical currents in the chip. Everywhere on the chip there is a tiny amount of resistance, and when you have currents going through resistors most of the energy turns into heat.
During readout from an image sensor there are a whole lot of transistors changing states, and hence they generate a bit of heat. When you take one picture there isn't too much build up of heat. But when you take several (usually 10-20) pictures every second (live view) there isn't enough time between the pictures to get rid of the heat generated. Over time this will heat the sensor.
I don't remember the numbers exactly, but a CCD should generate less heat than a CMOS, since it contains less logic (transistors) per pixel. While using live view I don't think the difference is too big, both will heat up.
Originally by user7271. Source · Licensed CC BY-SA 4.0
user7271
14y ago
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Generated from our catalog & community — verify before relying on it.
Yes—Live View generally makes the sensor heat up more than normal still shooting.
An image sensor is an electronic chip, so one major source of heat is its own operation. As the sensor is read out, many transistors switch states and current flows through tiny resistances in the chip, producing heat. With single photos, there is usually time for that heat to dissipate, but in Live View the sensor is being read continuously, so heat can build up.
Light can also contribute some heating, especially in bright sun, because the lens concentrates incoming light onto the shutter/sensor area. But in typical use, sensor/electronics activity is a significant cause of heating, not just light exposure.
Sensor type can matter. In general, CCD sensors are often considered to generate more heat during readout than CMOS designs, though the exact amount depends on the specific camera.
So the main causes are:
- electrical activity in the sensor/readout circuitry
- continuous operation such as Live View or rapid shooting
- incoming light energy, especially in strong sunlight
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