Background artifact issue

ASI's Range of Specialised CMOS camera's

Moderator: Sam

jmtanous
Posts: 10
Joined: Fri Jan 05, 2018 10:10 pm

Re: Background artifact issue

Post by jmtanous » Sat Jun 16, 2018 4:40 pm

Hi,

Since the calibration images don't fully match the properties of the light frames there is no way to correct this issue. There might be some workarounds in postprocessing where you can 'hide' the background residual artifacts but in doing so it is inevitable to remove weak real signals. For instance, I don't use noise reduction at all in my workflow to prevent damage to the week fine details of my images.

Would it be possible to trade in this camara and get another model? For instance, I am interested in the ASI071pro, are you willing to take my ASI294 and replace it with an ASI071pro? I am willing to pay shipping and price difference.

Regards,

Jose

User avatar
Support@ZWO
Posts: 713
Joined: Mon Apr 24, 2017 10:08 am

Re: Background artifact issue

Post by Support@ZWO » Mon Jun 18, 2018 2:34 am

Please send us a email to support(at)zwoptical.com
ZWO | Marketing Consultant
Location:lon=120.6 lat=31.3
SuZhou China

motto:
Don't face one's fate, can't be a real man;
Don't know manners, can't be gentle;
Don't know meaning behind the words, can't understand man's heart.

mvas
Posts: 2
Joined: Sun Sep 09, 2018 5:05 pm

Re: Background artifact issue

Post by mvas » Tue Sep 11, 2018 1:59 am

What was the FINAL SOLUTION to this problem?

User avatar
Sam
Posts: 2799
Joined: Thu Feb 21, 2013 2:51 am

Re: Background artifact issue

Post by Sam » Wed Sep 12, 2018 9:51 am

ASI294 is a very good camera but we cannot control the sensor's behavior
it's very easy to remove these faint artifacts in post-processing
ZWO Founder
Location:lon=120.6 lat=31.3
SuZhou China

wargrafix
Posts: 96
Joined: Fri Feb 12, 2016 2:29 am

Re: Background artifact issue

Post by wargrafix » Sun Sep 30, 2018 2:06 pm

Wasn't this issue related to the tec cooler?

User avatar
Support@ZWO
Posts: 713
Joined: Mon Apr 24, 2017 10:08 am

Re: Background artifact issue

Post by Support@ZWO » Wed Oct 03, 2018 3:34 pm

wargrafix wrote:Wasn't this issue related to the tec cooler?
Not the cooler.
ZWO | Marketing Consultant
Location:lon=120.6 lat=31.3
SuZhou China

motto:
Don't face one's fate, can't be a real man;
Don't know manners, can't be gentle;
Don't know meaning behind the words, can't understand man's heart.

wargrafix
Posts: 96
Joined: Fri Feb 12, 2016 2:29 am

Re: Background artifact issue

Post by wargrafix » Sun Oct 07, 2018 6:29 pm

Sean.Wang wrote:
wargrafix wrote:Wasn't this issue related to the tec cooler?
Not the cooler.

Then what?

bulrichl
Posts: 26
Joined: Sun May 27, 2018 9:18 am
Location: La Palma (Canary Islands)

Re: Background artifact issue

Post by bulrichl » Tue Oct 09, 2018 9:12 am

Sean.Wang wrote:
wargrafix wrote:Wasn't this issue related to the tec cooler?
Not the cooler.
In this thread, users of the ASI294MC Pro and several people that are interested in purchasing this camera have put their questions about the cause of this artifact. Unfortunately these questions have not been responded in an adequate manner.

You told us what is NOT the cause of the artifact (the tec cooler) - so, please answer our question: what is it then?

Bernd

User avatar
Sam
Posts: 2799
Joined: Thu Feb 21, 2013 2:51 am

Re: Background artifact issue

Post by Sam » Wed Oct 10, 2018 5:16 am

unlike CCD, CMOS is not a pure sensor IC
it builds in a lot of circuit like power, PLL, AD etc.
all these circuits affect the final output of one image

if there is such noise of the camera, it comes from the sensor
we can do nothing

so don't use the CMOS camera beyond its limit
294 is a very good sensor for astrophotography
but if you need to stretch the background heavily and no noise find
CCD is a better choice for such purpose
ZWO Founder
Location:lon=120.6 lat=31.3
SuZhou China

wargrafix
Posts: 96
Joined: Fri Feb 12, 2016 2:29 am

Re: Background artifact issue

Post by wargrafix » Wed Oct 10, 2018 4:56 pm

So, it's a case of overstretch vs length of exposure or total exposure time?

Post Reply