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Sensor Analysis ASI294c, e/ADU does not look right
Posted: Sat Mar 23, 2019 4:41 am
by jeff2011
I ran a sensor analysis on my ASI294c and got the following results. The read noise, full well and dynamic range match up reasonably well with the charts on the ZWO site for this camera but the e/ADU does not. I am reading something wrong. Unity gain should be at 117.
I am running version 3.1.5220.0 - 9/15/2018 of SharpCap.
https://astronomy-imaging-camera.com/wp ... -gain2.jpg
Code: Select all
Gain Value e/ADU Read Noise (e) Full Well (e) Dynamic Range (Stops)
0 16.0714142030097 7.53752174224834 65828.5125755277 12
60 8.14291550768592 6.5925696160008 33353.3819194815 12
61 8.04587319388374 6.57973512365759 32955.8966021478 12
100 5.15457818193343 6.11697264243057 21113.1522331993 11.7530365476134
200 1.42946315112455 1.52168091132598 5855.08106700617 11.9098075656661
300 0.455728374620029 1.34991023746001 1866.66342244364 10.4333826255565
400 0.144340557919445 1.30212964203694 591.218925238048 8.8266755488483
500 0.0478261629697139 1.32602478982334 195.895963523948 7.20683611400481
Re: Sensor Analysis ASI294c, e/ADU does not look right
Posted: Sat Mar 23, 2019 8:14 am
by admin
Hi,
Please can you try again using a new build of SharpCap (for instance the latest build of SharpCap 3.2). I have a feeling that the build your using is one that uses some code that ZWO added to let you ask the bit depth of the sensor. Unfortunately it doesn't always return the correct answer and in some cases returns a bit depth of 12 for sensors that actually have a bit depth of 14. After I discovered this I stopped using that code and went back to letting SharpCap calculate the bit depth of ZWO sensors on its own. So hopefully moving up to the latest version will then give you correct results.
Cheers, Robin
Re: Sensor Analysis ASI294c, e/ADU does not look right
Posted: Sat Mar 23, 2019 4:10 pm
by jeff2011
I will give that a try. After posting I realized there was a new version and was headed in that direction. Thanks for your explanation.
Jeff
Re: Sensor Analysis ASI294c, e/ADU does not look right
Posted: Sun Mar 24, 2019 3:26 am
by jeff2011
Yeah that was it. Had some trouble running the sensor analysis. I had to run it with my flat panel at full brightness even though it said it was dangerously close to the minimum exposure, but if I dimmed it seemed to get in an infinite loop when doing the last run of the analysis where I have to put the flat panel back on after the darks.
Code: Select all
Gain Value e/ADU Read Noise (e) Full Well (e) Dynamic Range (Stops)
0 4.02908006453318 7.58283303501757 66012.4477773116 13.0877135176907
59 2.06315791628021 6.61497460362282 33802.7793003349 12.3191186331654
61 2.01402262419965 6.59013061146756 32997.7466748871 12.2897728310637
100 1.2897888904043 6.13313570494464 21131.901180384 11.7505100749075
119 1.03898735613863 5.92967912350915 17022.7688429753 11.487224060193
121 0.881034306200522 1.7802178132847 14434.8660727893 12.9852163331331
200 0.357733555808615 1.53653833285024 5861.10657836835 11.8972735971345
300 0.113899777047556 1.34603543356084 1866.13394714715 10.4371204396525
400 0.0361835289651529 1.30630260475643 592.830938565066 8.82598779488045
500 0.0116709033465527 1.29247469935277 191.21608042992 7.2089240029386
Re: Sensor Analysis ASI294c, e/ADU does not look right
Posted: Tue Apr 09, 2019 7:30 pm
by donboy
The latest version of 3.2 still has the incorrect Sensor Library data in for the ASI294. I have been overwriting it with the ones from ver. 3.1.
Don
Re: Sensor Analysis ASI294c, e/ADU does not look right
Posted: Wed Apr 10, 2019 8:36 pm
by donboy
The Sensor Library was just updated with a new profile - v.3.2.5982