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Issue with darks on ZWO

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#1 jvaboyjunior

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Posted 29 May 2020 - 08:55 PM

Hi there,

 

I am taking darks on a ZWO ASI183MC Pro and have a starburst pattern on the right of all the images. I have attached the relevant part of a stretched dark capture. This is taken lens cap on, sensor at -10 degrees, exposure is 120s. My first thought was maybe there's a light leak so have just tested again inside a dark bag - same result. This does not show up on bias exposures at 1/1000s.

 

Is this an issue or does it not matter as stacking will remove it?

 

Advice much appreciated.

 

Thanks

 

Mike

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#2 DSOs4Me

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Posted 29 May 2020 - 09:12 PM

Normal Amp Glow. You an see it here  https://astronomy-im...s-amp-glow.html


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#3 SilverLitz

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Posted 29 May 2020 - 09:44 PM

Typical, normal dark calibration should remove it, but darks must of same temp (no problem w/ cooled), same gain, and same exposure time.


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#4 jvaboyjunior

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Posted 30 May 2020 - 10:12 AM

Brilliant, thanks!



#5 OldManSky

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Posted 30 May 2020 - 11:56 AM

As others have mentioned -- entirely normal.

Just be sure when you calibrate your images to turn OFF any "dark frame scaling" or "dark frame optimization" options.  And everything will be fine.


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