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Old 10-01-2023, 01:30 PM
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AstroViking (Steve)
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Join Date: Mar 2022
Location: Melbourne
Posts: 1,246
Thanks Alex and Alex,

It seems that most people just drop an image here and don't provide many of the details or back-story about it. Me, I want to know the details of people's images - particularly the gain/offset values. I can stop adding the "wall of text" if people are averse to it.

As for my Flats problem, I am trying to get images that are not over-exposed, nor have the hyper-green colouring caused by (I presume) the sensor's RBBG Bayer pattern. I have a flats-box with a variable brightness and have been experimenting with different length exposures.

I did try stacking with the Flats/DarkFlats that I captured, but had the most incredible green and purple halo around the outside of the stacked image. So I just stacked the Lights and Darks.

I have tried the KStars/Ekos flats wizard, but it never seems to create many images - it will claim it's capturing an image but the file never appears in the Flats folder; and the ones created are full of image artifacts. I've heard that ZWO cameras don't like really short exposures and what I am seeing tends to support this.

I'm also uncertain as to what ADU values I should use for the Ekos "Auto Flats" maker. Do I use the camera's bit depth (12-bits) or the 16-bits that's being reported to Ekos? There's a big difference between ((2^12)/2) and ((2^16)/2)...

Cheers,
V
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