ISSUES WITH FLAT FRAMES, ASI1600MM

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mantrain
Posts: 2
Joined: Wed Dec 18, 2019 9:07 pm

ISSUES WITH FLAT FRAMES, ASI1600MM

Post by mantrain » Wed Feb 12, 2020 8:01 pm

Hello, I have not been able to get my flat frames fully calibrated. I am getting edges around the subs.

I have a ASI1600, with 31mm 8 pos ZWO flywheel, + ZWO filters. The camera attaches the flywheel, which attaches to the 55mm spacers, which attaches to the focal reducer which attaches to the ES 127 ED FCD100. I have tried swapping the camera, to the spacers, to the flywheel as someone at ZWO had suggested.

Gain 128
TEC -13
exp time 180 sec

I have strictly followed the routing per Warren Keller and Pix insight.

This is the best image I am getting: channel red, 180 sec,
red m101.gif

Katherine.Tsai
Posts: 481
Joined: Fri Dec 07, 2018 10:24 am

Re: ISSUES WITH FLAT FRAMES, ASI1600MM

Post by Katherine.Tsai » Thu Feb 13, 2020 8:03 am

How about taking flats without filters? Does the ring appear?
It does not calibrated out with flats, right?

mantrain
Posts: 2
Joined: Wed Dec 18, 2019 9:07 pm

Re: ISSUES WITH FLAT FRAMES, ASI1600MM

Post by mantrain » Thu Feb 13, 2020 10:57 pm

I have not tried without filters but I can. I did increase the gain to 138 and it was much better.
Attachments
m101.png

Katherine.Tsai
Posts: 481
Joined: Fri Dec 07, 2018 10:24 am

Re: ISSUES WITH FLAT FRAMES, ASI1600MM

Post by Katherine.Tsai » Fri Feb 14, 2020 9:27 am

Yes it looks much better, you can also try 1. cablibrating the image with more flats.
2. add a filter masks to reduce light reflection.

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