Okay, I will re-upload these clips to wetransfer.
I just made a new pretty impressive discovery. Outside its -5°C at the moment and I've left my camera outside for half an hour so it could cool down to this temperature. Then I've powered it on and as soon as it was running I hit the trigger and recorded 15 seconds RAW uncompressed with lens cap on.
So I have a frame, that was done where the sensor was still nearly -5°C cold, and one at the end of that 15 second period, where the sensor must have warmed up just a little bit.
Then i let the camera warm up slowly to room temperature to avoid any condensation and I again captured a few seconds after the camera was running 15 minutes at room temperature.
So you will now see 3 frames:
1.: sensor at -5°C
2.: sensor ever so slightly warmer 15 seconds after the boot up at -5°C
3.: sensor at normal operating temperature (24°C Room temp and 15 minutes running)
All images were loaded into resolve with following settings: ISO 1600, exposure: +5(!)stops and a very aggressive curve to lift the image even higher!
- Frame 1
- 1600+5_Cold_A.jpg (731.35 KiB) Viewed 6083 times
- Frame 2
- 1600+5_Cold12sec_B.jpg (887.85 KiB) Viewed 6083 times
- Frame 3
- 1600+5_Warm_A.jpg (591.95 KiB) Viewed 6083 times
So the obvious question here is: Why is the sensor maintained at such high temperatures and not cooled down? Cooling it down nearly eliminates the image noise!
I will redo the test later to verify the results, because I cant really believe these results.
What do you say to this?
EDIT: I remember, that camera sensors, that are used for astrophotography are cooled down to -10 or -20 degrees or even lower to minimize all forms of noise. There were even modification kits available for some of the canon Eos models, that consisted of one or more Peltier elements and a sophisticated heat sink.
I believe, that the sensors used for scientific astronomical imaging are sometimes even cooled with liquid nitrogen.
This makes my question even more important: Why do cameras like Red, Alexa, Ursa (mini) HEAT the sensor to a stable temperature instead of cooling it down to the lowest temp possible?