Starburst Amp Glow Stacking Artifacts with ZWO 1600 MM-Pro - Forums

Topic starter

Feb 27, 2020 · Edited: Feb 27, 2020

Hi All, This is probably been discussed ad nauseam, but I have been having random problems with starburst amp glow artifacts on my ZWO 1600MM-Pro. https://www.dropbox....Hasq7UcMFa?dl=0
Here is my process:

253 x 60s Lum subs at -15c, Gain 76, Offset 15[/*]
50 x 60s Darks at -15c, Gain 76, Offset 15[/*]
25 x 0.01 Flats at -15c, Gain 76, Offset 15[/*]
25 x 0.01 Dark-Flats at -15c, Gain 76, Offset 15[/*]

I used the PixInsight Weighted Batch Preprocessing Script with the Galaxy Setting and auto rejection settings (I believe it selects ESD). I also ensure that "Optimize Dark Frames" is unchecked. I initially thought that this could be a darks issue so I recaptured a set last evening. I reran the exact settings with the new darks and and got the same result. I then tried Image Integration. Same result. Does anyone have insight into this? Thanks.

Helpful

Alberto Ibañez

Feb 27, 2020 · Edited: Feb 27, 2020

Hi John,

The flares on the right and bottom-left seem as a light leakage. You can cover the entire imaging rig with the darker cover you have to check it.

About the calibration I would suggest to use exposure times longer than 0.3s on the flats. Is a topic that has been discussed on CN. It is something that happens to the ASI1600 and the QHY163. What I don't know if this applies also to the Pro version.

Apart of this, Batch Processing it is supposed to be not to final calibration/stack, but only for testing purposes. About this subject I found Percentile Clipping to be the best for large number of subs (althought Winsored works well also).

Hope it helps.

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Richard Beck

Apr 30, 2020

I just ran across this. On flats, I was advised to use a dim enough light source so I could get flat durations of at least 10s. I had problems with correcting for my field flattener (SV80ST with SV field flattener). When I used the 10s and longer flats, the FF effects were well calibrated.