Update! I work with your method, but all big stars show a small satellite close in random direction in the subs. It is neutralized by stacking, but shows that the code for pre-capture is called before the Dither! I have opened a ticket with Stellarmate. You may also be interested since you went into the code and made it work in the first place?

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I have a ZWO EAF. Now I consider another Zwo EAF for the Piggyback telescope. Can INDI-Ekos handle two equal devices like that?

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Interesting that no error occurs when making a pause of 5 sec. I definitely will try that. When each sub is 300 sec that is not a great penalty. As for Version that works, I first detected the problem in Kstars 2.5.5. Jasem Mutlaq patched this version to make it work. I do not know what change he did, but I think all versions earlier than 2.5.5 is good. I have not found out how to specifically load an older version of gphoto2 and would love to see a procedure to do this.

Based on this tread i see the following Sony cameras: a6400, a7, a5000, a7s. Since I'm using the generic gphoto driver for my sony a5000 in stead of Sony DSLR i wonder if the problem is more widespread than Sony cameras?

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To verify if error is present, just make a capture sequence of 100 subs a 1 second. it usually fails within that somewhere. I have the issue on all my Sonys: a7 and two a5000 so it definitely is not a HW error.
The man behind StellarMate has debugged the problem logged into my system and recreated the problem. He has raised the issue with the maintainers of GPhoto2. He also made a patch to my system that fixed the problem for me. I just cannot upgrade anymore before the problem is solved in the releases. In the meantime it would be nice if someone made a detailed description of the installation of the patch...

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I tested with StellarMate the use of ASTAP and its Live Stack feature. The good news is that it works quite well. The bad news is that the user interface under RPi is terribly sluggish. Example is live stack of 17 subs:
 

 

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Could you use NTFS in stead of Ext4 just to make the SSD readable on your Windows machine?. Would be easier to get quickly to your subs after session.

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That's works perfect! I now have my second DSLR running on it's own RPi unattended. It just starts when I power on my Astro Photo rig and my Main RPi with the rest of the devices just connects to the server and use the camera!
 



  

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On my second RPi "Piggy" (with only simulator mount and Sony a5000) I did:
sudo apt purge kstars-bleeding indi-full
sudo apt autoremove
reboot
sudo apt install kstars-bleeding indi-full

I got exactly same result. Crashed INDI-Ekos-Kstars after some subs.

This Stellarmate is my original, gradually updated during a long time. It worked perfect before last update!

TeamViewer ID: 837685790

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I have now installed AstroBerry and forced update to Kstars 3.5.4 and INDI GPhoto 3.0 (inst 10).
Guess what! It also fails after about 40 subs, but does not crash INDI-Ekos-Kstars. In stead the capture sequence aborts. It is not possible to restart the sequence. Keeps retrying (download?) endlessly.

Strange that nobody else see this new problem?

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I have now installed an old StellarMate image and have verified that GPhoto CCD indi-sony-ccd version 2.9 works perfect on exact same HW configuration I used that did CRASH when using version 3.0

Please find the difference between the two versions and correct ASAP!

Is there a way to upgrade and protect my self from GPhoto CCD indi-sony-ccd version 3.0? Or better, can anyone tell me how to reinstall GPhoto CCD indi-sony-ccd version 2.9 in the newest version of Kstars 3.5.5?

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After having reinstalled INDI and Ekos same result. Here the last part of the log file:
[2021-09-21T17:12:51.289 CEST INFO ][           org.kde.kstars.indi] - Sony :  "[INFO] Starting 1 seconds exposure. "
[2021-09-21T17:12:52.758 CEST CRIT ][           org.kde.kstars.indi] - INDI driver  "indi_gphoto_ccd"  crashed!
[2021-09-21T17:12:53.380 CEST INFO ][           org.kde.kstars.ekos] - "Sony is offline."
[2021-09-21T17:13:04.285 CEST INFO ][           org.kde.kstars.ekos] - Ekos received a new device:  "Sony"
[2021-09-21T17:13:04.601 CEST INFO ][           org.kde.kstars.ekos] - Websocket Message "{\"type\":\"get_cameras\"}"
[2021-09-21T17:13:04.605 CEST INFO ][           org.kde.kstars.ekos] - Websocket Message "{\"type\":\"get_mounts\"}"
[2021-09-21T17:13:04.606 CEST INFO ][           org.kde.kstars.ekos] - Websocket Message "{\"type\":\"get_scopes\"}"
[2021-09-21T17:13:04.615 CEST INFO ][           org.kde.kstars.ekos] - Websocket Message "{\"type\":\"get_filter_wheels\"}"
[2021-09-21T17:13:04.615 CEST INFO ][           org.kde.kstars.ekos] - Websocket Message "{\"type\":\"get_domes\"}"
[2021-09-21T17:13:04.616 CEST INFO ][           org.kde.kstars.ekos] - Websocket Message "{\"type\":\"get_caps\"}"
[2021-09-21T17:13:04.616 CEST INFO ][           org.kde.kstars.ekos] - Websocket Message "{\"type\":\"get_states\"}"
[2021-09-21T17:13:05.004 CEST INFO ][           org.kde.kstars.indi] - Sony :  "[INFO] Sony is online. "
[2021-09-21T17:13:05.005 CEST INFO ][           org.kde.kstars.indi] - Sony :  "[INFO] Detected Sony Corporation Model ILCE-5000. "
[2021-09-21T17:13:05.005 CEST INFO ][           org.kde.kstars.ekos] - "Sony" Version: "3.0" Interface: 10 is connected.
[2021-09-21T17:13:05.006 CEST DEBG ][           org.kde.kstars.ekos] - 5  devices connected out of  5
[2021-09-21T17:13:05.006 CEST INFO ][           org.kde.kstars.ekos] - All INDI devices are now connected.
[2021-09-21T17:13:05.323 CEST INFO ][     org.kde.kstars.ekos.align] - "World Coordinate System (WCS) is enabled. CCD rotation must be set either manually in the CCD driver or by solving an image before proceeding to capture any further images, otherwise the WCS information may be invalid."
[2021-09-21T17:13:05.338 CEST INFO ][           org.kde.kstars.ekos] - "Sony is online."
[2021-09-21T17:13:05.618 CEST INFO ][           org.kde.kstars.indi] - Sony :  "[INFO] Loading device configuration... "
[2021-09-21T17:13:05.635 CEST INFO ][           org.kde.kstars.indi] - Sony :  "[INFO] Upload settings set to client only. "
[2021-09-21T17:13:05.642 CEST INFO ][           org.kde.kstars.indi] - Sony :  "[INFO] Force BULB is enabled. All expsures shall be captured in BULB mode except for subsecond captures. "
[2021-09-21T17:13:05.642 CEST INFO ][           org.kde.kstars.indi] - Sony :  "[INFO] Device configuration applied. "
[2021-09-21T17:13:05.643 CEST INFO ][           org.kde.kstars.indi] - Sony :  "[INFO] World Coordinate System is enabled. "
[2021-09-21T17:15:52.032 CEST INFO ][   org.kde.kstars.ekos.capture] - "Exposure timeout. Restarting exposure..."
 

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Two logfiles: the first contains the crash. The second is the log of a startup.
The tail containing the crash:

[2021-09-21T13:05:20.439 CEST INFO ][   org.kde.kstars.ekos.capture] - "Capturing 180.000-second  image..."
[2021-09-21T13:05:21.102 CEST INFO ][           org.kde.kstars.indi] - Sony :  "[INFO] Starting 180 seconds exposure. "
[2021-09-21T13:07:57.371 CEST DEBG ][                org.kde.kstars] - Centering on  "09h 55m 45s" " 68° 53' 02\""
[2021-09-21T13:08:22.175 CEST CRIT ][           org.kde.kstars.indi] - INDI driver  "indi_gphoto_ccd"  crashed!
[2021-09-21T13:08:22.419 CEST INFO ][           org.kde.kstars.ekos] - "Sony is offline."
[2021-09-21T13:08:23.636 CEST INFO ][     org.kde.kstars.ekos.align] - "World Coordinate System (WCS) is enabled. CCD rotation must be set either manually in the CCD driver or by solving an image before proceeding to capture any further images, otherwise the WCS information may be invalid."
[2021-09-21T13:08:23.800 CEST INFO ][           org.kde.kstars.indi] - ZWO CCD ASI120MM Mini :  "[INFO] World Coordinate System is enabled. "
[2021-09-21T13:08:28.944 CEST INFO ][           org.kde.kstars.ekos] - Ekos received a new device:  "Sony"
[2021-09-21T13:08:29.678 CEST INFO ][           org.kde.kstars.ekos] - Websocket Message "{\"type\":\"get_cameras\"

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