Jan 31 2026: APP 2.0.0-beta40 will soon be released with many fixes especially for Linux, upgraded development platform and 10-20% performance boost !
Jan 15 2026: FIXED LICENSE SERVER VPN Tunnel issue
 The issue could have prevented APP to start when using a VPN tunnel or another complicated network configuration, like using APP on a remote computer on a different continent. This issue is fixed now and APP should start normally.
Jan 04 2026: Update on the 2.0.0 release & the full manual
We are getting close to the 2.0.0 stable release and the full manual. The manual will soon become available on the website and also in PDF format. Both versions will be identical and once released, will start to follow the APP release cycle and thus will stay up-to-date to the latest APP version. Unfortunately, Mabula was struck by a severe flu virus in the past couple of weeks and thus could not work. He is getting much better now and he has resumed work to release 2.0.0 as soon as possible. Once 2.0.0 is released, the price for APP will increase. Owner's license holders will not need to pay an upgrade fee to use 2.0.0, neither do Renter's license holders.
Nov 28 2025:Â APP 2.0.0-beta39 has been released !
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Hello,
New user here
and was hoping I could get a bit of help with a problem. Â I've taken mono L, Ha, R,G,B images with the 1600mm Pro and have used APP to calibrate each channel. Â The calibrated LRGB lights look good, but the calibrated Ha lights seem to bright in the middle - They don't look correct. Â My details are as follows:
L - Using 50 Gain, 10 offset and Exposure of 45sec. Darks at 240 sec. @ 50 Gain. Flats & DarkFlats of 50 Gain @ same exposure times using NINA's FlatsWizard.
RGB - Using 50 Gain, 10 offset, and exposure of 60 sec. Darks at 60 sec. @ 50 Gain. Flats & DarkFlats of 50 Gain @ same exposure times using NINA's FlatsWizard.
Ha - Using 139 Gain, 10 offset, and exposure of 240 sec. Darks at 240 sec. @ 139 Gain. Flats & DarkFlats of 139 Gain @ same exposure times using NINA's FlatsWizard.
I was thinking it was related to the flats or dark flats, but when I calibrate the Ha frames using only lights and darks I still get the same issue of a brighter area in the center of the calibrated lights.
Attached are images of the lights (linear) and Lights (Calibrated). Â You can see the brightening of the image center in the calibrated frame. Also included images of my D, DF, F, MDF, and MF for reference. Â
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Not sure what I'm doing wrong, I'm very new to this. Â Going a bit crazy here : )
Thanks,
JoeÂ
Looks to me as if you have variations in your flats regarding what you're seeing, is that correct? You'd want a flat to be very similar, the same, across the panels as they need to capture the true vignetting profile and any possible dust. Now when not using them and still getting this brighter spot, could you also take out the darks and any other calibration data to test that as well?
@vincent-mod Without the Flats and Darks I don't see the bright spot in the lights alone. Â Do you think the problem is in the original flats? Â I could take a new set of flats and check. Â
Well you mentioned it was still there with the darks added, so removing those has solved the issue? That could point to an issue with the darks in this case.
