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?

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