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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 01 Mar 2018 (Thursday) 16:26
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Sensor heat, 5d4

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Mar 01, 2018 16:26 |  #1

After watching a couple instructional videos from very popular and reputable sources I realized there seemed to be a discrepancy regarding the info on sensor heat cause by long exposure. One part says 29 minutes 59 seconds is the maximum length of time a video shot can last and another says about 15 minutes is the longest bulb timer you should use so you don't over heat the sensor.

Just how long is it safe to keep the shutter open?

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Post edited 3 months ago by davesrose.
Mar 01, 2018 18:00 |  #2

Video length and exposure length with bulb are two different features. HDSLRs are limited to 29 minutes, 59 seconds video recording due to regulations (in order to not be taxed and considered a video camera). With long exposures, I've read that the 5D4 is good at them. The main aspect of long exposures is more noise can be induced, but new DSLR models have features for enabling noise reduction for long exposures.

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Mar 04, 2018 22:06 |  #3

It is safe to keep the shutter open as long as you want. The camera will shut down if the sensor is danger of overheating. I've not heard of this happening much though.

When that might happen will very much depend on what and where you are shooting. How someone came up with 15mins is beyond me. Shooting a lava field (or even sand dunes in Death Valley in the summer) is going to be a lot different than shooting the northern lights when it is -30F outside.

Also, in video the sensor is generating a lot more heat then in bulb mode.

But if you are shooting a lot of long exposures, you probably want to limit your use of LV. The hotter the sensor the more noise will be generated, although exactly what that relationship is for canon sensors I don't know.

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Sensor heat, 5d4
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