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SBIG ST-2000XM and changed e-/ADU

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#1 makintosz


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Posted 04 December 2012 - 04:26 AM


Recently I bought from someone an SBIG ST-2000XM Camera.

I did few tests and I found that Standard Deviation in bias frames i about 2,5x higher than my ST-2000XCM (now sold).

It was weird since both cams have same chip KAF 2020 etc.. so I searched further.

What I finally found is that e-/ADU is changed from oryginal 0.6 value to 0.26.

What can I do to switch it back to oryginal ? I dont want to return it to the guy I bought it since everything else is working fine.

I tried to contact SBIG about it to no avail so far...
I searched whole internet and didnt found any solution.

Dear Forum Members, Can You help me ?

Thanks in advance!


#2 Raginar


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Posted 04 December 2012 - 06:14 AM

Wrong forum. Try emailing SBIG again, they're definitely the best source for this type of information.

#3 ccs_hello


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Posted 04 December 2012 - 08:37 AM


Definitely wrong subforum. You can also try CCD subforum.

For others:
a useful info to compare astroimager with others...

(Many high-end) astro-imagers tend to be designed/optimized with a factory preset gain (ISO / gain / e-/ADU), post the actual sensor output stage. Many models are factory fixed at a preset value (though still modifiable) not easily modified through menu setting by the end-user. The value chosen tends to be optimized toward the best possible S/N for the optimal image quality, not the highest possible gain (some loosely call it sensitivity.)

Clear Skies!


#4 makintosz


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Posted 04 December 2012 - 09:50 AM

Thanks, I will post it in the CCD forum. I tought that CCD forum is more for imaging and procesing in itself.

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