After thinking about the dust on/in the eyepiece scenerio, that can't be right...what's the chances of always putting the EP in the same way every single time so that the dust spot/mote always ends up just left of centre everytime??.....
So it's on the sensor that I can't get to...great! As this camera is used for general daytime use as well as astrophotography & it doesn't affect shots other than astro-foto's, I've just been informed I will NOT be pulling the camera apart for 2 specks of crap......