ZWO ASI585MC Pro: strange lines in the B channel.

Are the diagonal bands visible in either bias, dark or flat? If so they can be corrected. If not then the bands are due to something else, most likely in the optics ahead of the sensor. Besides, if you bought it recently you might still be able to return and get a full refund.

So, with the telescope attached, are the bands visbile in the master flat? Can you show them?  And not the debayered ones, the original raw master flat (assuming the bias/dark isn't affected). If so, then a properly applied and created master flat would remove them (otherwise what would be the purpose of the flat?). And by "properly" I mean avoiding WBPP entirely.

Are the lights effected as well? If not there must be something wrong with the flats (LEDs in Flatpanel?).

if yes, it could be the sensor. Try other camera settings, and see if the lines still appear in your images.

Jean-David Gadina:
What flat panel did you use?
It might be an issue with the refresh rate of the LEDs if the panel uses PWM to operate the LEDs.

Thanks for the tip. I will try with another flat panel to check if it could be related to that.

Edited: MasterFlat using ImageCalibration+ImageIntegration: looks exactly the same than the one generated by WBPP. Flat grey without debayering; Lines visible after debayering.

You have to extract the B channel from the master raw flat. This will contain only the B pixels and not the blank ones and will show whether you have the issue as well or is related to something else. I guess is called CFASplit or something similar.

andrea tasselli:

Edited: MasterFlat using ImageCalibration+ImageIntegration: looks exactly the same than the one generated by WBPP. Flat grey without debayering; Lines visible after debayering.

You have to extract the B channel from the master raw flat. This will contain only the B pixels and not the blank ones and will show whether you have the issue as well or is related to something else. I guess is called CFASplit or something similar.

Thank you for the clue.

I have made a CFASplit and this is what the B channel shows: the lines.

I have already tried with different Gains ( the ASIAir doesn't allow to select a different offset ) and the result is just the same.

I have been chatting with a couple of Uranus-C cameras owners ( same sensor IMX585 ) and they don't have this issue. So Sony is not the problem, but ZWO. They only allow me to return the camera if the technical support considers that this is due to the making process, but their answer have been: "Sony don't guarantee uniformity of channel", so it's easier to blame others than to take action and exchange the device. I will try to deal with this somehow ( may be creating a synthetic Flat ) until I sell the camera and buy it from a different vendor ( as I see that PlayerOne is more serious than ZWO, I will buy one from them and move away from the ASIAir ). I have had to deal with ZWO's technical support arbitrariness in the past ( the fan vibration or the oil leak in the 2600 ) and I'm done with their behavior.

andrea tasselli:
While I do approve of moving out of ZWO ecosystem I still think you should be able to calibrate that effect away.

I have tried different approach today and I always get the same result: blue/yellow line crossing from bottom left to top right. I have tried with ImageCalibration, applying different PixelMath operations,  following a tutorial to make a synthetic flat, trying to make new flats... Nothing works here. I can't see any real alternative, because I haven't seen something like this out there ( although I will keep searching ). The only way I get those lines out is painting them with CloneStamp or with Photoshop. The obvious problem is when I remove something that really exist in the image... A complete mess!!

andrea tasselli:
Well, the usual way with hard-to-crack cases such as this in AB is to make the source images and calibration files available to the wider audience here and see whether some-else's approach might yield the hoped-for results. Just a suggestion here.

Ok, I have upload to my Google Drive a .zip file with the MasterBias, MasterDark, MasterFlat and 10 Lights in .fit format ( almost 200 MB ). May somebody knows how to deal with this: 

https://drive.google.com/file/d/1Ef_Iew7tY5m44hqNgzJIPTb4ADZUeHgm/view?usp=sharing

andrea tasselli:
If I'm not grossly mistaken you're taking these images without any filters. And with a refractor. This is very much no-no. In fact NO-NO. The image won't color calibrate properly and neither would the flats (which, given the example, are rather too flat). Get a IRCut pronto and repeat again. There is still a faint trace left but I guess the main issue is the massive IR leak.

Yes, you are right. So I have added tonight the IRCut filter. It's windy, so don't think I'm going to get good results, but at least confirm if the problem in the channel B can be solved that way. I made the Flats with the Automatic option in the ASIAir. It works perfectly both with the Hyperstar and the Focal Reducer in my C14, but seems that I have to try manually with this camera and scope. Thank you.