I was out testing some long exposures today, and right from the first test shot I noticed weird banding that had never appeared before:
I thought "oh no, i hope the sensor isn't bust", so I packed up and went home. I told my dad and showed him the picture. I then told him that I had my back to a bright sun then he suddenly clicked and said "ahhhh, that's probably light getting in through the viewfinder". I did another 30 second exposure test and the banding wasn't there, but there was no bright sun behind me.
Has anyone else had problems like this? Is there an official Pentax viewfinder cover I can get hold of? Any tips and tricks? I don't often use long exposures, I'm just starting to try them out.
Oh, and I know my sensor has blotches on it - I had it cleaned today to remove the hair and the splats.