Issues with Flats DSS and APP - Forums

Topic starter

Jan 15, 2023

I have two sets Oxygen III data for the Squid Nebula. One is 8 hours of data and the one below is 12 hours. The data with 8 hours calibrates well. I only have been taking flats and darks. I have tried calibrating and stacking the data below in both APP and DSS. I get the same results. I've also calibrated the data using master flats and darks. The stacked image below is what I wind up with every time. This is the only data set to ever do this. I kept my telescope and optical train on a pier outside during the summer. I never removed the optical train and I have multiple different sets of flats. I have tried them all and keep getting this result. It looks as if the flats are mirrored somehow. Has anyone ever seen this before? Thanks in advance.

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Oscar

Jan 15, 2023 · Edited: Jan 15, 2023

Check if you have dust on your filter or camera sensor, that can cause the circles. About the mirroring, I don't know how to fix that.

Pete Bouras

Jan 15, 2023

The top view of the flat indicates 64 bit. The data coming off the camera is 16 bit.
Perhaps the software does not work correctly with 64 bit data, or mixed bit depth data.
Try 16 bit flats, and 16 bit lights and see if the flats work properly.

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Andreas Zeinert

Jan 15, 2023

Well, you can easily get mirrors when your Flats, Darks are not done with the same program as your lights. I experienced this some years ago when I switched to Sequence Generator Pro to do my lights during the night but after the nights I continued to do my lights and darks with the genuine Atik program. This resulted in vertical mirrors and it took me a while to understand it as my optical train was not changed. This comes from the coding in the programs who will produce Fits files in various ways (in respect with columns and lines). You might check this if you use APP and DSS on the same time. Hope this helps.

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