Andreas replied to the topic 'Interesting Projekt - canonlense control with arduino/ascom' in the forum. 4 weeks ago

It's comercially available now:
astromechanics.org/ascom.html

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Andreas replied to the topic 'Right settings for ASI 183 MC Pro in INDI' in the forum. 2 months ago

The grid is the pixelmatrix. Don't zoom in that much ;)
Colours get real after colorcalibration.

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Andreas replied to the topic 'Right settings for ASI 183 MC Pro in INDI' in the forum. 2 months ago

Raw 16 is the right one. Then you have 16 bit per pixel that means you get the (chip origin)12 bit multiplied by 4 in the files. These files must be debayered.
RGB 24 means 8bit per colour, you get a ready coloured picture (the cam debayers it for you) but the dynamic is compressed to 8bit.
The ampglow of this chip is caracteristic for it. It even got named "starburst" glow. The glow gets stronger with exposuretime but can be calibrated out well with darks.
The darks must suit well: Same temperature and exposuretime is essential. Also avoid long exposuretimes (not more then 5min).
There is a really long thread on cloudinights about this as I mentioned before. Google for "IMX 183 starburst jon rista cloudynights".

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Andreas replied to the topic 'ASI 183 with USB 2 creates extreme readout noise at one side' in the forum. 4 months ago

Hi,
this doesn't seem to be readoutnoise - it's ampglow. Why one shows it and the other not I can't say but it only should be exposuretime dependant.
Amp glow described in the CN imx183 testthread here: www.cloudynights.com/topic/599475-sony-i...d-asi-qhy-etc/page-2

Andreas

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Andreas replied to the topic 'Using 3 cameras at once?' in the forum. 6 months ago

Hi there,

if dithering is active, does the sequencer wait for settling after dithering between exposures or must this be done by delay time?
Or is the guidemodule sending some "dithering performed and settled" signal for the sequencer is listening to? Is it like this with external guiders?
If one session of ekos is mastering the guider and scope and other sessions just listen to that guider saying "dithering ok", than the sessions would be synced and multicamera operation was easy.

Andreas

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Andreas replied to the topic 'Fixed pattern noise due to dithering' in the forum. 6 months ago

This is the cause of your "undithered" looking capture. Asuming pixelsize is nearly identical on both cams you dithered your main cam 2.8*1000/1200=2.33 pixel.
This is near nothing. Hot pixel or "ununiform behaving" ones are neighboring themselfs in the stack, this makes the rain fall.
Dither at least 10-20Pix with this configuration to separate them for sure.
Andreas

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Andreas replied to the topic 'Fixed pattern noise due to dithering' in the forum. 6 months ago

You should not see this misalignment (showing in noiserain) at all, if dithering went well. Maybe dithering was just not wide enough. How much pixel did you dither and what is the ratio between guide scope focal length and main scope focal length?

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Andreas replied to the topic 'ASI Camera - Gain/Offset/x-Bit' in the forum. 6 months ago

I think this is a misconception. Calibration frames like bias or darks might be clipped on the left side of the histogram with offset 0. This could introduce artifacts during calibration.
jonrista.com/the-astrophotographers-guid...oise-and-histograms/
scroll down to "Anatomy of Signals in Histograms". The offset value prevents the "separation" of beeing negative.
Andreas

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Andreas replied to the topic 'ASI Camera - Gain/Offset/x-Bit' in the forum. 6 months ago

Are the sensors really that uniform, one could take the values from others? I took biases with the qhy168 I got from a mate for gain 0, 5, 9, 11, 12, 13 ,14. For each gain set, I watched the histogram of the bias and adjusted the offset value, so that nothing of the left "foot" of the histogram was clipped to black.
The higher gain came, the higher the offset was to be set not to clip anything on the left side. The resulting offset/gain table was not linear in this case. I think in principal this should work the same way with any cmos cam.
These offset values then should be applied to all light and calibration frames of course.
What I don't understand is: why do manufacturers not normalize their setting to 0-100%, so every cam has different max gain settings now?

Andreas

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Andreas replied to the topic 'Fixed pattern noise due to dithering' in the forum. 6 months ago

Hi Alfred,

"...Ekos will move the guide star in a random direction for the amount of pixels specified in the dither input box..."
Seems like it didn't dither at all. The pattern looks like drift due to imperfect polaralignment. I seen this in undithered captures I did myself, too.

Andreas

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Andreas replied to the topic 'How to update telescope coordinates?' in the forum. 7 months ago

Where does that come from. This means I did anytime run indiserver as root?? How did I do this?

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Andreas replied to the topic 'How to update telescope coordinates?' in the forum. 7 months ago

Hi Jasem,

the owner is "root" and group was "root" too. I changed group to "username". Is this right?
Thanks
Andreas

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