Hello everyone, long time reader first time posting in this wonderful forum.
I recently purchased the Zwo1600 asi mono with filter wheel and a 0.67 reducer to use on my RC.
I’m at 86mm back focus in the image below. Recommendation is 85mm. Image taken through the Ha filter.
I’m getting these WiFi symbol shaped stars and the only way I’ve managed round ones is to remove the reducer.
Do you have any hints or suggestions that may work?
I’ve read that the filters could have an impact on back focus around 1mm but I’m at 86 anyway.
The whirlpool image was taken minus the reducer , I’ve also added an out of focus star with the reducer in case this helps.
Any help or advice greatly appreciated.
Many thanks,
Carl.