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Recording ambient Skyglow as Dark Frames? [Deep Sky] Acquisition techniques · Abhijit Juvekar · ... · 3 · 109 · 0

velociraptor1 2.71
Abhijit Juvekar
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Hi,

I have a thought about imaging the skyglow as Dark frames and use them in our image processing.

In city area if we manage to capture skyglow by pointing the telescope at Zenith position, we can Stop the mount tracking so it won't cross meridian.

Then we can simply out of focus the telescope to blur out stars and capture that out of focused Zenith pointed FoV at same exposures of our Light frames.

We can get uniform skyglow if capture multiple frames say 30-50 frames and use them as DARK Frames in our stacking process.

What it will benifit?

It will help to remove ambient background gradient from images which caused by light pollution.

Will get higher S/N ratio with same data.

You may try it with or without Light-pollution filters and check which gives better output.

Did anyone tried this method before?

Mention your inputs about the same.

Thanks
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spacetimepictures 4.82
Continuum - Laurent Lucas
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You would likely capture nasty gradients with it, that won't match with your data. I'd say it wouldn't work :/
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andreatax 9.89
andrea tasselli
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If anything, you would use it as a sky-flat but unless you are shooting in an area with few faint stars that procedure won't work either. And it is very time consuming to get enough noise free data just looking at the zenith. Just remember that if properly calibrated the value of the background is removed from the final image (caveat: sky gradients not captured by flats),

And, by the by, I've tried this as well as countless other methods and none works as well as a properly created flat frame.
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jhayes_tucson 26.84
John Hayes
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Adam Block has mentioned the use of night sky flats to me.  You might search his content.   He may have even done a video about it.  (I'm sitting on an airliner about to depart or I'd try to locate it for you.)

John
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