ZWO ASI 2600 DUO

[IPTelman]

Greetings

Latest SharpCap release from Jan. (I just updated to the latest this AM)
I've done a sensor analysis for my new camera.

Screenshot 2024-02-01 114004.png (200.34 KiB) Viewed 271 times

When I run a Sky Brightness set for read noise limit and max dynamic range, SharpCap always recommends a gain of 121 and not 100 as expected.

Should I be following manufacturer setting of 100 or is 121 in fact correct?

Thank you

[admin]

Hi,

because the analysis has not measured the values each side of the LCG/HCG switchover (99 and 100), SharpCap will think that the reduction in read noise is a gradual slope between the measured points at gain=75 and gain=119, rather than a cliff edge between 99 and 100. That will certainly tend to make the smart histogram think that gain 119-121 are the optimum values, rather than 100. It's also possible that gain can be pushed higher if the 'Max Exposure' setting is set to a short value - if SharpCap can't find a good solution at the optimum gain and also keep the exposure under the maximum, it will try higher gains.

Probably the best bet here is to re-run the analysis, but before you do so (after opening camera), run the following line of code in the SharpCap scripting console

Code: Select all

 SharpCap.SelectedCamera.SetGainsOfInterestForSensorAnalysis([99,100])

This will cause the analysis to measure at gain=99 and gain=100 (on top of the normal measurement points), which should resolve the issue once you have new data.

thanks,

Robin

[IPTelman]

I will re-run analysis with the code snippet and try again next clear night.
I'll also up the minimum exposure to 60 or 90 sec and max to 8 minutes.

Thank you

Derek