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ASI2400MC Pro - 100k Full Well with 14bit ADC?

astrophotography CMOS
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#1 Jim Waters

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Posted 13 January 2021 - 09:59 PM

Can somebody explain how the ASI2400MC Pro with a 14 bit ADC sensor can have a 100K full-well?  


Edited by Jim Waters, 13 January 2021 - 10:00 PM.


#2 Cfreerksen

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Posted 13 January 2021 - 10:27 PM

What don't you understand Jim? Well and bit depth are 2 different things. 14 bit is how many defined steps of intensity the camera can produce. 100K is how many electrons it takes to fill the pixel to it's max count.

 

Chris


Edited by Cfreerksen, 13 January 2021 - 10:35 PM.

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#3 Astrojedi

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Posted 13 January 2021 - 10:29 PM

At gain 0 it has almost 14 stops of dynamic range so looks about right. A 14bit ADC seems like a good match (purely from a design spec perspective).



#4 Jim Waters

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Posted 13 January 2021 - 10:30 PM

Got it.  Thx. smile.gif



#5 calypsob

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Posted 13 January 2021 - 11:18 PM

Its a fullframe with reasonably large pixels. That sensor is a beast


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#6 andysea

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Posted 13 January 2021 - 11:26 PM

I haven't seen many images taken with the camera. I'm very tempted to get one.



#7 ks__observer

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Posted 14 January 2021 - 12:16 AM

Ideally you want and ADC with a bit-depth resolution greater than the FWC size -- this way you reduce quantization error.

However stacking images increases bit-depth by the formula:

number samples = 2^(2*n), where n is the increase in bit depth

So if you stack 16 frames, your bit depth goes to 16-bits.

At 16-bits, 100,000FWC/65,536bits you basically have 1.5e/ADU -- so minimal quant error compared to pure single frame 14-bit.


Edited by ks__observer, 14 January 2021 - 12:18 AM.



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