I'm having a particular issue with imaging that I'm hoping to get some feedback on. I'm experiencing some kind of light/lamp glow in the center of my images and I'm not sure as to the cause. I have a Nikon D3300 (entry level) with an Orion ED80 on a Celestron AVX.
A few nights ago I took about an hour of M51 images and seem to be experiencing this issues on all my images, even in the original RAW image (have to up the exposure to see it).
My question is this, how do I resolve the glow in the center of the frame, what could be causing the issue, and is there anything that can be done about it?
I'm not sure if this is an issue with my camera settings or with the camera itself (or maybe light pollution ?). Any suggestion would be most helpful.
I've attached some images via the link below to if you'd like to take a look.
Thanks in advance for any advise/help.
64 Lights @ 1min ea
15 Darks @ 1min ea
16 Flats @ 1min ea
16 Bias @ 1/4000 ea
Processing: Nebulosity / Photoshop