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INDI Library v2.0.6 is Released (02 Feb 2024)

Bi-monthly release with minor bug fixes and improvements

Failure to take exposure with Starlight SXVR-M25C

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On my drive home I was thinking, maybe it isn't about chunk since, maybe this older model is just slower and needs a much much longer timeout. Next time I'll try increasing BULK_DATA_TIMEOUT.
4 years 5 months ago #44838

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Chunk size was the issue two years ago with my SXVR M25c, so whatever it is on now in the driver, was the one that worked, so any other setting and mine won’t work, so maybe we are going to need a separate driver..... :(
4 years 5 months ago #44847

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Nice to see success with the driver :)

I was thinking that there is a couple of options here, the easiest option would be to keep your changes to the sx driver and rename the file to something like indi-sxv and register as a new driver in the xml-file, the drawback would be you have to recompile the driver now and then and also patch the xml-file every time there is a update from ppa.
The second option is to find a way to recognize the camera and use your patched way to read the pixels, maybe Jasem would accept the way to do it.

So how to recognize the specific camera, I don't know if there is a way to get the id of the ccd, that would be the easiest way, otherwise maybe check for the exact resolution of the ccd ?? but that can create problems if there is an other cam with the same resolution so that's a bad way to do it.
I also thought about checking the cam's firmware version and resolution but that can also be a gamble.. ??
I'm a bit puzzled when checking the log you posted because it looks like it identifies it self as a "SX CCD SXVR-M25C" in "sxGetCameraModel" ??

Well done!!
4 years 5 months ago #44859

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I think that is the issue, the driver should recognise different cameras by there iD numbers, but for some reason these two cameras are being recognised as the same, when mine, the SXVR works fine with the current driver, but the OP’s camera is the SXV older version, with a slightly older sensor... is not...
4 years 5 months ago #44862

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So I've been able to take home the camera to try some more things. It really just is the timeout the whole time that was the issue. Unbinned it takes 14 seconds to transfer the image with the original chunk size. The timeout was 10s. I will make a pull request to increase the BULK_DATA_TIMEOUT to 20s.

github.com/indilib/indi-3rdparty/pull/11
Last edit: 4 years 5 months ago by Russell Valentine. Reason: Added github PR link.
4 years 5 months ago #45123

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How do the images look with the bayer? I recently submitted a fix to recognize this camera as "color" so that the bayer filter property is exposed. However, the final image looks "interlaced" and the bayer pattern does not match one captured on a PC by Maxim DL.
4 years 3 months ago #47238

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I've had a hard time finding any good information of how the bayer matrix should be with these cameras. Some forums like on cloudy nights implied that each chip could possibly have a different one (I kind of find it hard to believe).

I did have good luck with color. I made a pinhole lens with foil and a color chart with construction paper. So if for example I force RGGB and up-bottom orientation in Siril(I believe this setting used to be called kstars-ekos/pixinsight compatibility) and some white balancing, I get the attached image.

I've also taken a test image of M33 and the colors seemed pretty good this way. I've had some set backs with my setup so that is as far as I got. I hope to get back on track after all these holidays.

I'm not an expert on maxim but maybe it has something to do with the up-bottom orientation?



P.S. Edit: I believe the person who sold it, did so because they had too much trouble getting the color right. I know this is just hearsay, and I don't know what software this person was using, but it might be possible Maxim didn't have it right either.
Last edit: 4 years 3 months ago by Russell Valentine.
4 years 3 months ago #47259
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I've maybe misunderstood your message. If your recent bayer change is in, I can try it next time I'm out.
4 years 3 months ago #47260

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I took some images tonight and viewed them through the fits viewer. I took a picture of that same color chart with the pin hole setup. The colors for sure are off. I notice right off the bat red shows as green. I'll be able to look specifically what is going on with the bayer matrix Thursday evening and will reply with my findings.
4 years 2 months ago #47801

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No this is my fault. I made changes to the driver to make bayer work for SXVF-M25C. So it looks like that SXVR-M25C has a different bayer pattern after all. I just pushed a fix, can you please git pull and test again?
4 years 2 months ago #47809

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Should be BGGR...what have you used...?
4 years 2 months ago #47813

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@knro

Ok using 7cc5083cc152aeaa4edc9b6fd824771945a95f60 checkout in indi-3rdparty. Red is blue and the other colors look pretty gray in the KStars FITS Viewer.

The fits file:
drive.google.com/file/d/1kevYZIeXffF76uE...MRk/view?usp=sharing

I can look into what might be happening in regard to the bayer sometime tomorrow probably.

Edit: Some notes about playing around in fitsworks4. I seem to get some good color matching in that with GGBR and this image.
Last edit: 4 years 2 months ago by Russell Valentine.
4 years 2 months ago #48276

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