Hey, guys, I guess you are right, so thanks for that.
Yes I was using a 3.3 field flattener, but I must admit I didn't look too closely. Will inspect tonite. The Meade DSI also has a IR filter in front of the ccd so I guess there could be lots of light paths for dust bunnies. but why would those 2 spots reproduce themselves all over the screen. must be reflections eh? You dont think its anything to do with the temperature??
I will give everything a good clean and try at the weekend.
