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HELP weird pattern noise asi1600mm-c

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#1 GreenDay

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Posted 16 December 2018 - 04:17 PM

This is one of my first times using my asi 1600mm cool and have a small problem. I have this weird pattern noise, If anybody knows how to resolve this it would be greatly appreciated.

The settings for this test was 

30x2min 2x2 bin subs in HA at unity gain with cooling set at -20C.

30x2min 2x2 bin dark (same gain and temp)

 

I realize now i probably shouldn't bin my frames but I was just trying to test it out for an hour or so under clear skies. 

Any help would be appreciated. No flats or biased frames were used.

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  • tadpole_bad noise-min.jpg


#2 GreenDay

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Posted 16 December 2018 - 04:18 PM

To me it almost looks like when you take a video at a really low bit rate.



#3 Churmey

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Posted 16 December 2018 - 04:38 PM

Looks like "RAW 8" might have been selected in the ascom settings panel, instead of what you want - RAW16.  I've done this before and it reminds me of what i see here.....


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#4 GreenDay

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Posted 16 December 2018 - 04:41 PM

That's what I was thinking as well. I did however select raw16 in the sequence generator pro settings for the camera. Is this the correct way to change the setting? Or do I need to go to the ascom control panel and change something there?

#5 ChrisWhite

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Posted 16 December 2018 - 10:58 PM

Looks like 8 bit to me as well. Where you connect the camera in ago there is a little tool icon next to it that acceded the driver settings.

#6 spokeshave

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Posted 17 December 2018 - 09:11 AM

Looks like 8 bit to me as well. Where you connect the camera in ago there is a little tool icon next to it that acceded the driver settings.

Well, 10-bit anyway. When binned, the ASI1600 uses a 10-bit ADC.

 

Tim


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#7 ChrisWhite

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Posted 17 December 2018 - 08:28 PM

Well, 10-bit anyway. When binned, the ASI1600 uses a 10-bit ADC.

 

Tim

 

I think this looks more like the driver was set to 8bit.. not an artifact from binning. 



#8 GreenDay

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Posted 28 December 2018 - 08:41 PM

I think this looks more like the driver was set to 8bit.. not an artifact from binning. 

How would I go about changing this? I'm using SGP to image, would I be correct in changing the setting in there or do I need to go somewhere else?



#9 ChrisWhite

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Posted 28 December 2018 - 09:32 PM

See my previous post. There is an icon in SGP next to the camera connect button that accesses the driver. Make sure it is set to 16bit.

#10 MattC867

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Posted 28 December 2018 - 11:09 PM

Also, @OP, there is zero benefit of binning a CMOS camera if you're imaging DSOs unless you want the smaller file size/download rate.  Otherwise, 2x2 binning here is functionally equivalent to a 2X downsample in post and does not improve S/N of the raw data as CCDs do in some situations.  


Edited by MattC867, 28 December 2018 - 11:09 PM.



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