Had a reverse curve focus pop up

[yomamma]

I was imaging last night and had done several focuses with no problem.
Here is the result of the last good focus.

Info 23:10:34.830260 #1 Focus data used for fit :
34376,6.298677
34415,6.0688663
34454,5.011956
34493,5.028465
34532,4.962467
34571,4.961881
34610,5.1056395
34649,5.6550126
34688,6.6867394 in void SharpCap.FrameTransforms.Focus.Scanner.LogFitStatus(int iStep, bool end)
Info 23:10:34.830417 #1 Full focus data at end of scan :
34376,6.298677
34415,6.0688663
34454,5.011956
34493,5.028465
34532,4.962467
34571,4.961881
34610,5.1056395
34649,5.6550126
34688,6.6867394

Nice curve and it focused.
I imaged for another half hour then did another focus( all of this is in sequence and uses the same focus subroutine)
Here is the result

34469,9.831187
34508,10.538938
34547,11.5598545
34586,9.124503
34625,7.5006394
34664,8.346503
34703,9.025254 in void SharpCap.FrameTransforms.Focus.Scanner.LogFitStatus(int iStep, bool end)
Info 23:44:54.186065 #1 Full focus data at end of scan :
34391,8.243543
34430,9.554813
34469,9.831187
34508,10.538938
34547,11.5598545
34586,9.124503
34625,7.5006394
34664,8.346503
34703,9.025254

I get what looks like a reverse curve.

I have no idea what happened. This was all in a sequence running the same focus routine over and over.
If you want the entire log it is zipped here.

https://internetsearchtechnologies.com/ ... 7-11544.7z

Thanks

[yomamma]

I forgot to mention that clouds were not an issue, as that could have caused it

[admin]

Hi,

do you have any captured images from about the times of those two different scans? As well as the inverted curve, the FWHM measurements are almost 2x bigger for the bad curve, so I expect that something odd is being measured at that point - if we have some images, maybe we can re-test them and observe the same thing happening and understand what is going on that way.

cheers,

Robin