UPDATE FROM MABULA
I have had a very rough 2 months unfortunately health wise. I was struck 3x in a row with bacterial infections. The second infection occurred after a routine hospital checkup and I became very sick. I had to rest and take a lot of antibiotics. Once I was recovering and restarting work 1 month ago, I again became sick. The infection was not yet gone, so even more antibiotics and rest was needed. Needless to say, it took a lot of my energy and I needed a lot of rest.
Finally, the infection is really gone and my energy is coming back step-by-step now and I have started work again. I am terribly sorry to have kept you waiting for support. I will address all outstanding questions and e-mails step-by step and will be on the forum daily from today.
APP 2.0.0-beta47 will come soon as well, a lot of work was already completed before I became very ill, so the release is also nearly ready for you. Beta47 will be much faster actually. Many workflows will be more than 2x faster, mosaics can even be 10x faster than before because registration really received a major boost... all compared to beta46. Before I release it, I will make sure that everything is working properly and then I will release it.
Hi,
I am using a OSC camera (ASI294MC Pro) with the STC Duo-Narrowband filter. My OAG prism intrudes on the light path, covering the top left corner. Normally, flats help mitigate this. When I use Ha-OIII Extract Ha, the calibrated image looks fine:
But if I change the debayer algorithm to Ha-OIII Extract OIII, the corner that is shadowed by the OAG prism brightens up (and you can see more of the ASI294MC's characteristic amp glow in the top right):
This happens whether or not I take flats with the Duo-Narrowband. Why are the calibrated OIII images not appearing to take flats into account correctly?
That's an interesting question indeed. Could you share some lights that show this issue, together with your master calibration frames?
Go to https://upload.astropixelprocessor.com and use upload1 as username and upload1 as password.
Create a directory named “geordan-flatsproblem” and upload in there. Thank you!
For me, it happens the opposite.
Flat seems to correct well on both ha-o3 color and extract o3, but not on extract ha: it corrects well on 3 corners of the frame, except the one in the upper left where an evidence of some flat correction problem can be seen..
Ha: upper left corner is the problem while 3 other corners are ok
O3: quite well corrected
Color: well corrected
@vincent-mod I have uploaded the files; let me know if you need more data!
Thanks Geordan, I'll have a close look today!
So I do see a big shadow it seems on the top left, that must be the prism then. Haven't seen it like this much I have to say, but I also have no personal experience using prisms.
So I looked at the Ha and OIII and I see the problem I think. It seems that the background still has a bit of a signal for Ha, but is 0 in the OIII. My guess is that if you expose your flats for longer, this may be better. Try to shift the histogram to 70% ADU or something, it shouldn't clip of course but that might help.
Thanks -- I'll give that a shot when I can!
