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Sensor warm Up doing long exposure

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5 years 10 months ago #686 by Serdar Dikdik
our friend Olaf shared a knowledge I did not know. He informed that "During long exposures, the sensor is warming up, noise is increasing then. So it might be better in certain situations, to increase the ISO a little bit to decrease the exposure-time"


this knowledge makes me think, so if the sensor is warming up and creating noise in the long exposure(the topic was about 120sec exposure), how are we shooting movies as long as 20minutes or longer without the noise?

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5 years 10 months ago #692 by Olaf Kleemeyer
Good question. I don´t know. I read about this sensor-warmup in serveral books about lowlight- an nite-photography. And it seemed logical to me and comes up with my own experiences. But maybe it´s obsolete due to the modern and improved sensors. I don´t know :unsure:

Nikon D700, Nikkor 24mm 1.4, 50mm 1.4, 70-200mm 2.8

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5 years 10 months ago #695 by Serdar Dikdik
I cought you olaf I cought you my friend hahaha

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5 years 10 months ago - 5 years 10 months ago #696 by Olaf Kleemeyer
Maybe you caught me :) But I´m not sure, although I wouldn´t mind. On the other hand, consider that doing video on DSLR means nothing but shooting 20 or 30 single frames per second. This might be a difference comparing to exposing one frame for 30 seconds or even for minutes. Maybe somebody around here has more knowledge about that than we have ;)

Nikon D700, Nikkor 24mm 1.4, 50mm 1.4, 70-200mm 2.8
Last Edit: 5 years 10 months ago by Olaf Kleemeyer.

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5 years 10 months ago #703 by Serdar Dikdik
My friend I am engineer cant help, questions come to my mind:

If video shooting is just like taking pictures 1/30 shutter speed continuously up to 30 pictures a second as you say,Than why we are not hearing the shutter sound clicking while shooting movie

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5 years 10 months ago #705 by Jeff Bullman
While shooting video you're only using around 2 megapixels, guess the noise just fades away at that resolution.
The following user(s) said Thank You: Serdar Dikdik

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5 years 10 months ago #708 by thibault
lol! the shutter doesn't open or close during video, your sensor and processor do all the work.

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5 years 10 months ago #711 by Serdar Dikdik
I agree with you,so if the sensor is open all the time, than how it is not warming up. like said in above posts

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