Last night I had two unexpected hours of clear sky. I decided to go for the Gamma cas nebula in h-alpha. I knew Navi was going to be a pain, but I did not expect the big internal reflection I saw on the final image. And now I am wondering: what could have caused these reflections and what can be done about them?
The optical train: 130mm PDS newton | Baader MPCC m3 | ZWO OAG | Baader Ha-filter 7nm | ASI1600. I am guessing it is the MPCC, given the size of the reflection. Although there is also the small donut in the lower right corner. And there is microlensing from the ASI, but I expected that to occur. The image is a stack of 11x480s subs.
If I want to avoid these relfections in the future, would that require a corrector upgrade? A better filter? Or just shorter subs? Thanks for your input!