ISSUES WITH FLAT FRAMES, ASI1600MM

mantrain

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

How about taking flats without filters? Does the ring appear?

It does not calibrated out with flats, right?

mantrain

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

katherine.tsai

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.