[ASI1600] Hatched pattern in flat frame

ASI's Range of Specialised CMOS camera's

Moderators: Sam, Sean.Wang

Hatched pattern in flat frame

Postby szg » Sat Apr 14, 2018 4:11 pm

Please help me get through this problem.
I have hatched pattern in flat frame. This affected to my final image on object gradient trail.

My test flat took with minimal equipment, no 12VDC & external power supply connected (powered by notebook battery).

This flat took through telescope.
There're hatched pattern along gradient pattern.
2.jpg


This flat took without telescope, directly expose sensor to natural light. Sensor window covered by white 2" eyepiece dust cap as diffuser.
Hatched pattern shown lesser but still there.
4-BareCamera2.jpg
Flat without telescope


Sample final image. I remove stars and add increase the exposure to clearly show the pattern.
jelly patched.jpg
szg
 
Posts: 3
Joined: Sat Dec 23, 2017 5:12 am

Re: Hatched pattern in flat frame

Postby chad » Mon Apr 16, 2018 2:23 am

Hi Paul,
Please check the email.
Thanks
Chad
ZWO Driver Engineer
Location:lon=120.6 lat=31.3
SuZhou China
User avatar
chad
 
Posts: 219
Joined: Thu Feb 09, 2017 4:58 am

Re: Hatched pattern in flat frame

Postby Sean.Wang » Mon Apr 16, 2018 5:26 am

flat frames is normal, could provide a original flat frame for us? put on dropbox.
Looks flat didn't calibrate the light well. Does the brightness of flat reach 25000-30000ADU?
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.
User avatar
Sean.Wang
 
Posts: 110
Joined: Mon Apr 24, 2017 10:08 am

Re: Hatched pattern in flat frame

Postby szg » Mon Apr 16, 2018 4:15 pm

Sean.Wang wrote:flat frames is normal, could provide a original flat frame for us? put on dropbox.
Looks flat didn't calibrate the light well. Does the brightness of flat reach 25000-30000ADU?


These flat are stretched. Original flats took around 30000 ADU.
Original flat at gain=300 submitted to Chad for analysis, Here is the same one I submitted to him.
https://www.dropbox.com/s/0jfwhl9f1794fir/Target%201_CLS-CCD_0.06sec_1x1_Gain300_Offset50_frame1_30C.fit?dl=0
szg
 
Posts: 3
Joined: Sat Dec 23, 2017 5:12 am

Re: Hatched pattern in flat frame

Postby GeneralT001 » Mon Apr 16, 2018 4:39 pm

Aren't the flats supposed to be taken around 12000-17000 ADU? 30000 seems extremely high?
GeneralT001
 
Posts: 16
Joined: Wed Jan 11, 2017 11:29 pm

Re: Hatched pattern in flat frame

Postby Sean.Wang » Tue Apr 17, 2018 2:31 am

30000ADU will be better, we got a lot of users tried this.
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.
User avatar
Sean.Wang
 
Posts: 110
Joined: Mon Apr 24, 2017 10:08 am


Return to Cameras

Who is online

Users browsing this forum: No registered users and 5 guests