Author Topic: Serious Issue with Flatfield  (Read 806 times)

Offline nmontec

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Serious Issue with Flatfield
« on: 2016 March 22 15:37:30 »
Dear All,
 
my imaging train is: focuser+adapter+SX-AO-LF+CCD
 
If I take off the SX-AO unit from the imaging train all is fine, but when I have it, I get a weird uneven illumination field (the external brighter ring). I tried with either flats from a flat panel and sky flats but they do not have success in flatting the field. The issue is visible only on L and R filters, and not on G and B. I am using Astrodon Gen2 E filters.
 
I'm so much confused now that I would give everything up and just use the DBE from PixInsight, but I'd rather prefer to fight against the issue from the source, but I don't know what to try next.
 
I attach a raw frame stretched to see the uneven field illumination.
 
Nicola

Offline pfile

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Re: Serious Issue with Flatfield
« Reply #1 on: 2016 March 22 21:35:01 »
there must be some shiny metal somewhere in the nosepiece(s) for the AO... what does it look like in there?

rob