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ASI 183MC PRO darker circular areas on light.

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#1 vincex256

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Posted 27 May 2019 - 04:01 AM

Hi to all, anyone have see a darker circular areas when try to expose light at 300 sec with 100gain ?
For some time I have noticed that on my new Asi183MC appear to me in the exposures of the darker circular zones in comparison to the rest of the image.
The zones are usually circular in shape and seem to not always be in the same position.
I have already sent an email with the FIT to download to the ZWO support e-mail address.
I thought it was a dirty optical problem but it's not like that. I can't understand if it's a sensor problem or anything else. These dark areas do not appear if I use the zero-gain camera. This occurs when using the camera with AsiAir, temp -15 and Gain 100.
Suggestion Help ?  :oops:

 

P.S.: Addendum, the strange thing is that area not is totally dark, Stars are present on this areas but the background are more dark that the rest of light.

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#2 Tapio

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Posted 27 May 2019 - 04:49 AM

Have you taken flats and calibrated with them ?



#3 kathyastro

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Posted 27 May 2019 - 07:02 AM

My first guess would be dust.


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#4 vincex256

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Posted 27 May 2019 - 07:03 AM

Have you taken flats and calibrated with them ?

No. I have do just some photo before wearher goes bad

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#5 vincex256

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Posted 27 May 2019 - 07:03 AM

My first guess would be dust.

Ok but seem more big to be simply dust.

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#6 Tapio

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Posted 27 May 2019 - 07:33 AM

Size depends on the distance between dust and imaging chip.

https://www.ccdware....ources/dust.cfm


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#7 vincex256

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Posted 27 May 2019 - 07:59 AM

Size depends on the distance between dust and imaging chip.
https://www.ccdware....ources/dust.cfm

This is interesting, i intend your link. I have do a test suggested from ZWO, set temp to -15C, no dew appear on glass or on sensore under the glass all seems clear.

I do a Dark and stretching istogram nothig appear on image.

At this time i have to find wehere is on Optical dust problem.

Inviato dal mio SM-G960F utilizzando Tapatalk

Edited by vincex256, 27 May 2019 - 07:59 AM.



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