I have a problem with some halo when taking picture of the Alnitak/horsehead/flame region. As you can see in the picture below. The filter is a 36mm unmounted filter with blackened sides all over. I dont see any damages or issues with the filter, but was wondering if this was normal or if not what i should look into
I am using it with an ASI1600MM pro / AT115EDT with the new Ver2 0.8 Reducer-Flattener and ZWO filter wheel.
The image below is at 600s and gain of 139 from bortle 7
Edited by aarshad81, 29 November 2021 - 12:21 PM.