My Nikon D5300, HA modified, had a really dirty sensor. I bought a sensor cleaning kit and cleaned it yesterday. I finally had good seeing last night, so I got a couple hours in on M101. This is what came out. The only thing I did differently was to clean the sensor. Did I mess this up terribly? My thought is that it left some sort of smear on the sensor. Any advice on what to do (besides "Don't clean your sensor")? How can I salvage this?
Thanks so much for any help.