New Nebula or a moving dust spot?

For those interested in imaging and image processing with DSLR, CCD, webcam or film.
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DRatledge
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New Nebula or a moving dust spot?

Post by DRatledge » Sat Oct 20, 2018 12:04 pm

Taking flats (images of a white or featureless background) is a pain but unless they are taken frequently can lead to mystery objects appearing in our images.


The image below was processed with a 10 day old flat - in those 10 days a dust spot on the filter has decided to move. As a result my old flat has produced a black hole and a "new" nebula. Oh dear - new flats required and hopefully the dust spot hasn't moved again.
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moving-dust.jpg
moving-dust.jpg (187.07 KiB) Viewed 1641 times

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bbones
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Re: New Nebula or a moving dust spot?

Post by bbones » Wed Oct 24, 2018 12:30 pm

Thanks David

A good example to show why you need to take them before moving the equipment

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