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INDI Library v1.9.5 Released (08 Mar 2022)

Bi-monthly INDI Library released with new drivers and bug fixes.

Detecting Misted Optics

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I lost several hours imaging last week due to a dew heater not working correctly. I was wondering whether it's possible to detect the gradual fogging of the objective glass by some kind of image analysis during a EKOS capture session?

I saw that guiding could be halted above a certain HFR limit. I put the resulting CR2 images through DSS and while the quality of the images fell off rapidly the star sharpness did not. I assume then that the HFR value returned for each image won't help in this case ?

Am I missing something that could assist please?

BTW - I found the culprit. USB connector disconnected but was under the coiled cable tidy so couldn't see it. Now taped up, but I'd still be interested in any comments.
WO ZS61 II, ASI183MC Pro, ZWO 120MM-S Guider, ZWO EAF, HEQ5 Pro, INDI/EKOS on Ubuntu 20.04
Last edit: 4 months 20 hours ago by Damian.
4 months 21 hours ago #79516
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Replied by Ken Self on topic Detecting Misted Optics

Something that counts the stars and lets you set some threshold like a percentage of the stars found in the first image?. The alignment module does something like that so maybe it could be adapted.
-- Ken
RPi3 Ubuntu Server 20.04, Windows 10 AMD64, AAEON UP Core Ubuntu Desktop 20.04
Avalon M-Uno, EQ6 Pro, Atik420, ASI1600MM-C, ASI120MM-S, DBK21AU04, ZWO EFW, Optec TCFSi
Vixen R150S, GSO RC8, ST80
4 months 3 hours ago #79555

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Replied by Damian on topic Detecting Misted Optics

Thanks Ken,

Yes something that counts the stars then over a set threshold (say 10% difference from first frame) alarms to the user.
This may also catch where alignment is badly drifting or some other occurrences causing a major difference between the initial image.
Maybe a feature request ...
WO ZS61 II, ASI183MC Pro, ZWO 120MM-S Guider, ZWO EAF, HEQ5 Pro, INDI/EKOS on Ubuntu 20.04
4 months 2 hours ago #79562

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