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INDI Library v1.8.3 Released (02 Jan 2020)

Minor monthly bugfix release with a new RainbowAstro mount driver and improved pier side simulation.

AZ synscan : strange behavior, can someone explain, please?

2 weeks 4 days ago
gubi
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AZ synscan : strange behavior, can someone explain, please? #49242
See the attached screenshot:



I've turned on "Lock Telescope Centre" so the KStar centre should be aligned to the telescope indicator, but it off by more than a full moon.
On the INDI control panel you can see the coordinates of the scope, it is updated live as the scope tracking.
On the Ekos control panel you can also see the coordinates of the scope, and it is also updated live as the scope tracking.
But the two is differing by more than 2°. Actually the coordinates on the INDI control panel is where the Kstars centre is located on the screen, while the coordinates on the Ekos mount control panel is where the telescope indicator is on the screen. So it seems the "Lock Telescope Centre" locks to the coordinates that is also displayed on the INDI control panel.
But the scope is actually looking at the coordinates that can be seen on the Ekos mount control panel and where the scope indicator is on the screen. So I was able to see the edge of the moon in the scope (quite accurate mount alignment!).
It is not just a visual discrepancy, when I right click on some object on the skymap, and select "Synscan -> goto" it slews the scope off the target about the same offset. It makes the whole system quite unusable.
The offset is somehow connected to the alignment of the synscan controller, it is different each time I repeat the 2 or 3 star alignment process on the mount.

Can someone explain me what is going on here?

Zoltan

ps: I use indi_synscan_telescope driver, my INDI library version is 1.8.3
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