https://bugs.kde.org/show_bug.cgi?id=398198
Bug ID: 398198
Summary: Mount tracking while taking flats in "Wall" mode
Product: kstars
Version: 2.9.8
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: mutla...@ikarustech.com
Reporter: eric.dejouha...@gmail.com
Target Milestone: ---
When capturing flats in "Wall" mode with AltAz coordinates, mount is left to
track after slewing. Mount must not track while taking flats.
In the case of a real flat panel hanging on a wall, the mount may not have the
time to drift away by the time flat frames are taken. In this (intended) use
case, the problem is there but the symptom doesn't appear.
However while option "Dawn/Dusk" is not currently implemented in Ekos, it is
nonetheless possible to take dawn/dusk flats in "Wall" mode and use a
particular area of the sky as light source.
Because the mount is tracking while in this mode, stars that may appear during
capture will remain at the same place on the frame, defeating the purpose of
the flat.
Side note about the current implementation of exposure calibration in the
"Wall" mode: at a certain point in the dawn/dusk transition interval, the ADU
calculation is not able to follow the speed at which the sky luminosity
changes. Exposure adjustment is indeed calibrated for a static light source.
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