Best low light FF Canon DSLR

Started 3 months ago | Discussions thread
Dr_Jon Veteran Member • Posts: 6,079
Re: depends

Mako2011 wrote:

Dr_Jon wrote:

Mako2011 wrote:

Dr_Jon wrote:

Mako2011 wrote:

Dr_Jon wrote:

Again. Really. You can capture it

Yes...ISO does not affect what the sensor captured.

but as there is no way whatever to see it it's pointless.

YMMV

Okay, if you have a tunnelling electron microscopy you might be in with a shot, but you'd need to disassemble the chip while keeping it powered

Or just a camera and Photoshop

No, as the data won't be in the Raw file...

Depends .....regardless, the ISO setting won't affect how much light the sensor captures

But you' agree there is no way you can use most of that data as it is not available to you in any way, as it was clipped at the ISO amplifier?

Example - you can get 3V from a full pixel. The ADC converts 0-3V into 16k divisions.

At ISO 100 the ISO amplifier passes 0-3V to the ADC .
If the pixel was 1/8 full you get a count of 2k
If the pixel was 1/4 full you get a count of 4k
If the pixel was 1/2 full you get a count of 8k
If the pixel was 3/4 full you get a count of 12k

At ISO 200 it doubles the signal. 0-1.5V becomes 0-3V and 1.5-3V gets limited to 3V and
you have no idea what value was in a pixel that was more than half full.
If the pixel was 1/8 full you get a count of 4k
If the pixel was 1/4 full you get a count of 8k
If the pixel was 1/2 full you get a count of 16k
If the pixel was 3/4 full you get a count of 16k

At ISO 400 it quadruples the signal. 0-0.75V becomes 0-3V and 0.75-3V gets limited to 3V and you have no idea what value was in a pixel that was more than a quarter full.
If the pixel was 1/8 full you get a count of 8k
If the pixel was 1/4 full you get a count of 16k
If the pixel was 1/2 full you get a count of 16k
If the pixel was 3/4 full you get a count of 16k

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